insipid/webroot/lib/phpmailer/PHPMailer.php

<?php
/**
 * PHPMailer - PHP email creation and transport class.
 * PHP Version 5.5.
 *
 * @see https://github.com/PHPMailer/PHPMailer/ The PHPMailer GitHub project
 *
 * @author    Marcus Bointon (Synchro/coolbru) <phpmailer@synchromedia.co.uk>
 * @author    Jim Jagielski (jimjag) <jimjag@gmail.com>
 * @author    Andy Prevost (codeworxtech) <codeworxtech@users.sourceforge.net>
 * @author    Brent R. Matzelle (original founder)
 * @copyright 2012 - 2019 Marcus Bointon
 * @copyright 2010 - 2012 Jim Jagielski
 * @copyright 2004 - 2009 Andy Prevost
 * @license   http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
 * @note      This program is distributed in the hope that it will be useful - WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.
 */

namespace PHPMailer\PHPMailer;

/**
 * PHPMailer - PHP email creation and transport class.
 *
 * @author Marcus Bointon (Synchro/coolbru) <phpmailer@synchromedia.co.uk>
 * @author Jim Jagielski (jimjag) <jimjag@gmail.com>
 * @author Andy Prevost (codeworxtech) <codeworxtech@users.sourceforge.net>
 * @author Brent R. Matzelle (original founder)
 */
class PHPMailer
{
	const CHARSET_ASCII = 'us-ascii';
	const CHARSET_ISO88591 = 'iso-8859-1';
	const CHARSET_UTF8 = 'utf-8';

	const CONTENT_TYPE_PLAINTEXT = 'text/plain';
	const CONTENT_TYPE_TEXT_CALENDAR = 'text/calendar';
	const CONTENT_TYPE_TEXT_HTML = 'text/html';
	const CONTENT_TYPE_MULTIPART_ALTERNATIVE = 'multipart/alternative';
	const CONTENT_TYPE_MULTIPART_MIXED = 'multipart/mixed';
	const CONTENT_TYPE_MULTIPART_RELATED = 'multipart/related';

	const ENCODING_7BIT = '7bit';
	const ENCODING_8BIT = '8bit';
	const ENCODING_BASE64 = 'base64';
	const ENCODING_BINARY = 'binary';
	const ENCODING_QUOTED_PRINTABLE = 'quoted-printable';

	const ENCRYPTION_STARTTLS = 'tls';
	const ENCRYPTION_SMTPS = 'ssl';

	const ICAL_METHOD_REQUEST = 'REQUEST';
	const ICAL_METHOD_PUBLISH = 'PUBLISH';
	const ICAL_METHOD_REPLY = 'REPLY';
	const ICAL_METHOD_ADD = 'ADD';
	const ICAL_METHOD_CANCEL = 'CANCEL';
	const ICAL_METHOD_REFRESH = 'REFRESH';
	const ICAL_METHOD_COUNTER = 'COUNTER';
	const ICAL_METHOD_DECLINECOUNTER = 'DECLINECOUNTER';

	/**
	 * Email priority.
	 * Options: null (default), 1 = High, 3 = Normal, 5 = low.
	 * When null, the header is not set at all.
	 *
	 * @var int
	 */
	public $Priority;

	/**
	 * The character set of the message.
	 *
	 * @var string
	 */
	public $CharSet = self::CHARSET_ISO88591;

	/**
	 * The MIME Content-type of the message.
	 *
	 * @var string
	 */
	public $ContentType = self::CONTENT_TYPE_PLAINTEXT;

	/**
	 * The message encoding.
	 * Options: "8bit", "7bit", "binary", "base64", and "quoted-printable".
	 *
	 * @var string
	 */
	public $Encoding = self::ENCODING_8BIT;

	/**
	 * Holds the most recent mailer error message.
	 *
	 * @var string
	 */
	public $ErrorInfo = '';

	/**
	 * The From email address for the message.
	 *
	 * @var string
	 */
	public $From = 'root@localhost';

	/**
	 * The From name of the message.
	 *
	 * @var string
	 */
	public $FromName = 'Root User';

	/**
	 * The envelope sender of the message.
	 * This will usually be turned into a Return-Path header by the receiver,
	 * and is the address that bounces will be sent to.
	 * If not empty, will be passed via `-f` to sendmail or as the 'MAIL FROM' value over SMTP.
	 *
	 * @var string
	 */
	public $Sender = '';

	/**
	 * The Subject of the message.
	 *
	 * @var string
	 */
	public $Subject = '';

	/**
	 * An HTML or plain text message body.
	 * If HTML then call isHTML(true).
	 *
	 * @var string
	 */
	public $Body = '';

	/**
	 * The plain-text message body.
	 * This body can be read by mail clients that do not have HTML email
	 * capability such as mutt & Eudora.
	 * Clients that can read HTML will view the normal Body.
	 *
	 * @var string
	 */
	public $AltBody = '';

	/**
	 * An iCal message part body.
	 * Only supported in simple alt or alt_inline message types
	 * To generate iCal event structures, use classes like EasyPeasyICS or iCalcreator.
	 *
	 * @see http://sprain.ch/blog/downloads/php-class-easypeasyics-create-ical-files-with-php/
	 * @see http://kigkonsult.se/iCalcreator/
	 *
	 * @var string
	 */
	public $Ical = '';

	/**
	 * Value-array of "method" in Contenttype header "text/calendar"
	 *
	 * @var string[]
	 */
	protected static $IcalMethods = [
		self::ICAL_METHOD_REQUEST,
		self::ICAL_METHOD_PUBLISH,
		self::ICAL_METHOD_REPLY,
		self::ICAL_METHOD_ADD,
		self::ICAL_METHOD_CANCEL,
		self::ICAL_METHOD_REFRESH,
		self::ICAL_METHOD_COUNTER,
		self::ICAL_METHOD_DECLINECOUNTER,
	];

	/**
	 * The complete compiled MIME message body.
	 *
	 * @var string
	 */
	protected $MIMEBody = '';

	/**
	 * The complete compiled MIME message headers.
	 *
	 * @var string
	 */
	protected $MIMEHeader = '';

	/**
	 * Extra headers that createHeader() doesn't fold in.
	 *
	 * @var string
	 */
	protected $mailHeader = '';

	/**
	 * Word-wrap the message body to this number of chars.
	 * Set to 0 to not wrap. A useful value here is 78, for RFC2822 section 2.1.1 compliance.
	 *
	 * @see static::STD_LINE_LENGTH
	 *
	 * @var int
	 */
	public $WordWrap = 0;

	/**
	 * Which method to use to send mail.
	 * Options: "mail", "sendmail", or "smtp".
	 *
	 * @var string
	 */
	public $Mailer = 'mail';

	/**
	 * The path to the sendmail program.
	 *
	 * @var string
	 */
	public $Sendmail = '/usr/sbin/sendmail';

	/**
	 * Whether mail() uses a fully sendmail-compatible MTA.
	 * One which supports sendmail's "-oi -f" options.
	 *
	 * @var bool
	 */
	public $UseSendmailOptions = true;

	/**
	 * The email address that a reading confirmation should be sent to, also known as read receipt.
	 *
	 * @var string
	 */
	public $ConfirmReadingTo = '';

	/**
	 * The hostname to use in the Message-ID header and as default HELO string.
	 * If empty, PHPMailer attempts to find one with, in order,
	 * $_SERVER['SERVER_NAME'], gethostname(), php_uname('n'), or the value
	 * 'localhost.localdomain'.
	 *
	 * @see PHPMailer::$Helo
	 *
	 * @var string
	 */
	public $Hostname = '';

	/**
	 * An ID to be used in the Message-ID header.
	 * If empty, a unique id will be generated.
	 * You can set your own, but it must be in the format "<id@domain>",
	 * as defined in RFC5322 section 3.6.4 or it will be ignored.
	 *
	 * @see https://tools.ietf.org/html/rfc5322#section-3.6.4
	 *
	 * @var string
	 */
	public $MessageID = '';

	/**
	 * The message Date to be used in the Date header.
	 * If empty, the current date will be added.
	 *
	 * @var string
	 */
	public $MessageDate = '';

	/**
	 * SMTP hosts.
	 * Either a single hostname or multiple semicolon-delimited hostnames.
	 * You can also specify a different port
	 * for each host by using this format: [hostname:port]
	 * (e.g. "smtp1.example.com:25;smtp2.example.com").
	 * You can also specify encryption type, for example:
	 * (e.g. "tls://smtp1.example.com:587;ssl://smtp2.example.com:465").
	 * Hosts will be tried in order.
	 *
	 * @var string
	 */
	public $Host = 'localhost';

	/**
	 * The default SMTP server port.
	 *
	 * @var int
	 */
	public $Port = 25;

	/**
	 * The SMTP HELO/EHLO name used for the SMTP connection.
	 * Default is $Hostname. If $Hostname is empty, PHPMailer attempts to find
	 * one with the same method described above for $Hostname.
	 *
	 * @see PHPMailer::$Hostname
	 *
	 * @var string
	 */
	public $Helo = '';

	/**
	 * What kind of encryption to use on the SMTP connection.
	 * Options: '', static::ENCRYPTION_STARTTLS, or static::ENCRYPTION_SMTPS.
	 *
	 * @var string
	 */
	public $SMTPSecure = '';

	/**
	 * Whether to enable TLS encryption automatically if a server supports it,
	 * even if `SMTPSecure` is not set to 'tls'.
	 * Be aware that in PHP >= 5.6 this requires that the server's certificates are valid.
	 *
	 * @var bool
	 */
	public $SMTPAutoTLS = true;

	/**
	 * Whether to use SMTP authentication.
	 * Uses the Username and Password properties.
	 *
	 * @see PHPMailer::$Username
	 * @see PHPMailer::$Password
	 *
	 * @var bool
	 */
	public $SMTPAuth = false;

	/**
	 * Options array passed to stream_context_create when connecting via SMTP.
	 *
	 * @var array
	 */
	public $SMTPOptions = [];

	/**
	 * SMTP username.
	 *
	 * @var string
	 */
	public $Username = '';

	/**
	 * SMTP password.
	 *
	 * @var string
	 */
	public $Password = '';

	/**
	 * SMTP auth type.
	 * Options are CRAM-MD5, LOGIN, PLAIN, XOAUTH2, attempted in that order if not specified.
	 *
	 * @var string
	 */
	public $AuthType = '';

	/**
	 * An instance of the PHPMailer OAuth class.
	 *
	 * @var OAuth
	 */
	protected $oauth;

	/**
	 * The SMTP server timeout in seconds.
	 * Default of 5 minutes (300sec) is from RFC2821 section 4.5.3.2.
	 *
	 * @var int
	 */
	public $Timeout = 300;

	/**
	 * Comma separated list of DSN notifications
	 * 'NEVER' under no circumstances a DSN must be returned to the sender.
	 *         If you use NEVER all other notifications will be ignored.
	 * 'SUCCESS' will notify you when your mail has arrived at its destination.
	 * 'FAILURE' will arrive if an error occurred during delivery.
	 * 'DELAY'   will notify you if there is an unusual delay in delivery, but the actual
	 *           delivery's outcome (success or failure) is not yet decided.
	 *
	 * @see https://tools.ietf.org/html/rfc3461 See section 4.1 for more information about NOTIFY
	 */
	public $dsn = '';

	/**
	 * SMTP class debug output mode.
	 * Debug output level.
	 * Options:
	 * * SMTP::DEBUG_OFF: No output
	 * * SMTP::DEBUG_CLIENT: Client messages
	 * * SMTP::DEBUG_SERVER: Client and server messages
	 * * SMTP::DEBUG_CONNECTION: As SERVER plus connection status
	 * * SMTP::DEBUG_LOWLEVEL: Noisy, low-level data output, rarely needed
	 *
	 * @see SMTP::$do_debug
	 *
	 * @var int
	 */
	public $SMTPDebug = 0;

	/**
	 * How to handle debug output.
	 * Options:
	 * * `echo` Output plain-text as-is, appropriate for CLI
	 * * `html` Output escaped, line breaks converted to `<br>`, appropriate for browser output
	 * * `error_log` Output to error log as configured in php.ini
	 * By default PHPMailer will use `echo` if run from a `cli` or `cli-server` SAPI, `html` otherwise.
	 * Alternatively, you can provide a callable expecting two params: a message string and the debug level:
	 *
	 * ```php
	 * $mail->Debugoutput = function($str, $level) {echo "debug level $level; message: $str";};
	 * ```
	 *
	 * Alternatively, you can pass in an instance of a PSR-3 compatible logger, though only `debug`
	 * level output is used:
	 *
	 * ```php
	 * $mail->Debugoutput = new myPsr3Logger;
	 * ```
	 *
	 * @see SMTP::$Debugoutput
	 *
	 * @var string|callable|\Psr\Log\LoggerInterface
	 */
	public $Debugoutput = 'echo';

	/**
	 * Whether to keep SMTP connection open after each message.
	 * If this is set to true then to close the connection
	 * requires an explicit call to smtpClose().
	 *
	 * @var bool
	 */
	public $SMTPKeepAlive = false;

	/**
	 * Whether to split multiple to addresses into multiple messages
	 * or send them all in one message.
	 * Only supported in `mail` and `sendmail` transports, not in SMTP.
	 *
	 * @var bool
	 */
	public $SingleTo = false;

	/**
	 * Storage for addresses when SingleTo is enabled.
	 *
	 * @var array
	 */
	protected $SingleToArray = [];

	/**
	 * Whether to generate VERP addresses on send.
	 * Only applicable when sending via SMTP.
	 *
	 * @see https://en.wikipedia.org/wiki/Variable_envelope_return_path
	 * @see http://www.postfix.org/VERP_README.html Postfix VERP info
	 *
	 * @var bool
	 */
	public $do_verp = false;

	/**
	 * Whether to allow sending messages with an empty body.
	 *
	 * @var bool
	 */
	public $AllowEmpty = false;

	/**
	 * DKIM selector.
	 *
	 * @var string
	 */
	public $DKIM_selector = '';

	/**
	 * DKIM Identity.
	 * Usually the email address used as the source of the email.
	 *
	 * @var string
	 */
	public $DKIM_identity = '';

	/**
	 * DKIM passphrase.
	 * Used if your key is encrypted.
	 *
	 * @var string
	 */
	public $DKIM_passphrase = '';

	/**
	 * DKIM signing domain name.
	 *
	 * @example 'example.com'
	 *
	 * @var string
	 */
	public $DKIM_domain = '';

	/**
	 * DKIM Copy header field values for diagnostic use.
	 *
	 * @var bool
	 */
	public $DKIM_copyHeaderFields = true;

	/**
	 * DKIM Extra signing headers.
	 *
	 * @example ['List-Unsubscribe', 'List-Help']
	 *
	 * @var array
	 */
	public $DKIM_extraHeaders = [];

	/**
	 * DKIM private key file path.
	 *
	 * @var string
	 */
	public $DKIM_private = '';

	/**
	 * DKIM private key string.
	 *
	 * If set, takes precedence over `$DKIM_private`.
	 *
	 * @var string
	 */
	public $DKIM_private_string = '';

	/**
	 * Callback Action function name.
	 *
	 * The function that handles the result of the send email action.
	 * It is called out by send() for each email sent.
	 *
	 * Value can be any php callable: http://www.php.net/is_callable
	 *
	 * Parameters:
	 *   bool $result        result of the send action
	 *   array   $to            email addresses of the recipients
	 *   array   $cc            cc email addresses
	 *   array   $bcc           bcc email addresses
	 *   string  $subject       the subject
	 *   string  $body          the email body
	 *   string  $from          email address of sender
	 *   string  $extra         extra information of possible use
	 *                          "smtp_transaction_id' => last smtp transaction id
	 *
	 * @var string
	 */
	public $action_function = '';

	/**
	 * What to put in the X-Mailer header.
	 * Options: An empty string for PHPMailer default, whitespace/null for none, or a string to use.
	 *
	 * @var string|null
	 */
	public $XMailer = '';

	/**
	 * Which validator to use by default when validating email addresses.
	 * May be a callable to inject your own validator, but there are several built-in validators.
	 * The default validator uses PHP's FILTER_VALIDATE_EMAIL filter_var option.
	 *
	 * @see PHPMailer::validateAddress()
	 *
	 * @var string|callable
	 */
	public static $validator = 'php';

	/**
	 * An instance of the SMTP sender class.
	 *
	 * @var SMTP
	 */
	protected $smtp;

	/**
	 * The array of 'to' names and addresses.
	 *
	 * @var array
	 */
	protected $to = [];

	/**
	 * The array of 'cc' names and addresses.
	 *
	 * @var array
	 */
	protected $cc = [];

	/**
	 * The array of 'bcc' names and addresses.
	 *
	 * @var array
	 */
	protected $bcc = [];

	/**
	 * The array of reply-to names and addresses.
	 *
	 * @var array
	 */
	protected $ReplyTo = [];

	/**
	 * An array of all kinds of addresses.
	 * Includes all of $to, $cc, $bcc.
	 *
	 * @see PHPMailer::$to
	 * @see PHPMailer::$cc
	 * @see PHPMailer::$bcc
	 *
	 * @var array
	 */
	protected $all_recipients = [];

	/**
	 * An array of names and addresses queued for validation.
	 * In send(), valid and non duplicate entries are moved to $all_recipients
	 * and one of $to, $cc, or $bcc.
	 * This array is used only for addresses with IDN.
	 *
	 * @see PHPMailer::$to
	 * @see PHPMailer::$cc
	 * @see PHPMailer::$bcc
	 * @see PHPMailer::$all_recipients
	 *
	 * @var array
	 */
	protected $RecipientsQueue = [];

	/**
	 * An array of reply-to names and addresses queued for validation.
	 * In send(), valid and non duplicate entries are moved to $ReplyTo.
	 * This array is used only for addresses with IDN.
	 *
	 * @see PHPMailer::$ReplyTo
	 *
	 * @var array
	 */
	protected $ReplyToQueue = [];

	/**
	 * The array of attachments.
	 *
	 * @var array
	 */
	protected $attachment = [];

	/**
	 * The array of custom headers.
	 *
	 * @var array
	 */
	protected $CustomHeader = [];

	/**
	 * The most recent Message-ID (including angular brackets).
	 *
	 * @var string
	 */
	protected $lastMessageID = '';

	/**
	 * The message's MIME type.
	 *
	 * @var string
	 */
	protected $message_type = '';

	/**
	 * The array of MIME boundary strings.
	 *
	 * @var array
	 */
	protected $boundary = [];

	/**
	 * The array of available languages.
	 *
	 * @var array
	 */
	protected $language = [];

	/**
	 * The number of errors encountered.
	 *
	 * @var int
	 */
	protected $error_count = 0;

	/**
	 * The S/MIME certificate file path.
	 *
	 * @var string
	 */
	protected $sign_cert_file = '';

	/**
	 * The S/MIME key file path.
	 *
	 * @var string
	 */
	protected $sign_key_file = '';

	/**
	 * The optional S/MIME extra certificates ("CA Chain") file path.
	 *
	 * @var string
	 */
	protected $sign_extracerts_file = '';

	/**
	 * The S/MIME password for the key.
	 * Used only if the key is encrypted.
	 *
	 * @var string
	 */
	protected $sign_key_pass = '';

	/**
	 * Whether to throw exceptions for errors.
	 *
	 * @var bool
	 */
	protected $exceptions = false;

	/**
	 * Unique ID used for message ID and boundaries.
	 *
	 * @var string
	 */
	protected $uniqueid = '';

	/**
	 * The PHPMailer Version number.
	 *
	 * @var string
	 */
	const VERSION = '6.1.1';

	/**
	 * Error severity: message only, continue processing.
	 *
	 * @var int
	 */
	const STOP_MESSAGE = 0;

	/**
	 * Error severity: message, likely ok to continue processing.
	 *
	 * @var int
	 */
	const STOP_CONTINUE = 1;

	/**
	 * Error severity: message, plus full stop, critical error reached.
	 *
	 * @var int
	 */
	const STOP_CRITICAL = 2;

	/**
	 * SMTP RFC standard line ending.
	 *
	 * @var string
	 */
	protected static $LE = "\r\n";

	/**
	 * The maximum line length supported by mail().
	 *
	 * Background: mail() will sometimes corrupt messages
	 * with headers headers longer than 65 chars, see #818.
	 *
	 * @var int
	 */
	const MAIL_MAX_LINE_LENGTH = 63;

	/**
	 * The maximum line length allowed by RFC 2822 section 2.1.1.
	 *
	 * @var int
	 */
	const MAX_LINE_LENGTH = 998;

	/**
	 * The lower maximum line length allowed by RFC 2822 section 2.1.1.
	 * This length does NOT include the line break
	 * 76 means that lines will be 77 or 78 chars depending on whether
	 * the line break format is LF or CRLF; both are valid.
	 *
	 * @var int
	 */
	const STD_LINE_LENGTH = 76;

	/**
	 * Constructor.
	 *
	 * @param bool $exceptions Should we throw external exceptions?
	 */
	public function __construct($exceptions = null)
	{
		if (null !== $exceptions) {
			$this->exceptions = (bool) $exceptions;
		}
		//Pick an appropriate debug output format automatically
		$this->Debugoutput = (strpos(PHP_SAPI, 'cli') !== false ? 'echo' : 'html');
	}

	/**
	 * Destructor.
	 */
	public function __destruct()
	{
		//Close any open SMTP connection nicely
		$this->smtpClose();
	}

	/**
	 * Call mail() in a safe_mode-aware fashion.
	 * Also, unless sendmail_path points to sendmail (or something that
	 * claims to be sendmail), don't pass params (not a perfect fix,
	 * but it will do).
	 *
	 * @param string      $to      To
	 * @param string      $subject Subject
	 * @param string      $body    Message Body
	 * @param string      $header  Additional Header(s)
	 * @param string|null $params  Params
	 *
	 * @return bool
	 */
	private function mailPassthru($to, $subject, $body, $header, $params)
	{
		//Check overloading of mail function to avoid double-encoding
		if (ini_get('mbstring.func_overload') & 1) {
			$subject = $this->secureHeader($subject);
		} else {
			$subject = $this->encodeHeader($this->secureHeader($subject));
		}
		//Calling mail() with null params breaks
		if (!$this->UseSendmailOptions || null === $params) {
			$result = @mail($to, $subject, $body, $header);
		} else {
			$result = @mail($to, $subject, $body, $header, $params);
		}

		return $result;
	}

	/**
	 * Output debugging info via user-defined method.
	 * Only generates output if SMTP debug output is enabled (@see SMTP::$do_debug).
	 *
	 * @see PHPMailer::$Debugoutput
	 * @see PHPMailer::$SMTPDebug
	 *
	 * @param string $str
	 */
	protected function edebug($str)
	{
		if ($this->SMTPDebug <= 0) {
			return;
		}
		//Is this a PSR-3 logger?
		if ($this->Debugoutput instanceof \Psr\Log\LoggerInterface) {
			$this->Debugoutput->debug($str);

			return;
		}
		//Avoid clash with built-in function names
		if (is_callable($this->Debugoutput && !in_array($this->Debugoutput, ['error_log', 'html', 'echo']))) {
			call_user_func($this->Debugoutput, $str, $this->SMTPDebug);

			return;
		}
		switch ($this->Debugoutput) {
			case 'error_log':
				//Don't output, just log
				error_log($str);
				break;
			case 'html':
				//Cleans up output a bit for a better looking, HTML-safe output
				echo htmlentities(
					preg_replace('/[\r\n]+/', '', $str),
					ENT_QUOTES,
					'UTF-8'
				), "<br>\n";
				break;
			case 'echo':
			default:
				//Normalize line breaks
				$str = preg_replace('/\r\n|\r/m', "\n", $str);
				echo gmdate('Y-m-d H:i:s'),
				"\t",
					//Trim trailing space
				trim(
				//Indent for readability, except for trailing break
					str_replace(
						"\n",
						"\n                   \t                  ",
						trim($str)
					)
				),
				"\n";
		}
	}

	/**
	 * Sets message type to HTML or plain.
	 *
	 * @param bool $isHtml True for HTML mode
	 */
	public function isHTML($isHtml = true)
	{
		if ($isHtml) {
			$this->ContentType = static::CONTENT_TYPE_TEXT_HTML;
		} else {
			$this->ContentType = static::CONTENT_TYPE_PLAINTEXT;
		}
	}

	/**
	 * Send messages using SMTP.
	 */
	public function isSMTP()
	{
		$this->Mailer = 'smtp';
	}

	/**
	 * Send messages using PHP's mail() function.
	 */
	public function isMail()
	{
		$this->Mailer = 'mail';
	}

	/**
	 * Send messages using $Sendmail.
	 */
	public function isSendmail()
	{
		$ini_sendmail_path = ini_get('sendmail_path');

		if (false === stripos($ini_sendmail_path, 'sendmail')) {
			$this->Sendmail = '/usr/sbin/sendmail';
		} else {
			$this->Sendmail = $ini_sendmail_path;
		}
		$this->Mailer = 'sendmail';
	}

	/**
	 * Send messages using qmail.
	 */
	public function isQmail()
	{
		$ini_sendmail_path = ini_get('sendmail_path');

		if (false === stripos($ini_sendmail_path, 'qmail')) {
			$this->Sendmail = '/var/qmail/bin/qmail-inject';
		} else {
			$this->Sendmail = $ini_sendmail_path;
		}
		$this->Mailer = 'qmail';
	}

	/**
	 * Add a "To" address.
	 *
	 * @param string $address The email address to send to
	 * @param string $name
	 *
	 * @throws Exception
	 *
	 * @return bool true on success, false if address already used or invalid in some way
	 */
	public function addAddress($address, $name = '')
	{
		return $this->addOrEnqueueAnAddress('to', $address, $name);
	}

	/**
	 * Add a "CC" address.
	 *
	 * @param string $address The email address to send to
	 * @param string $name
	 *
	 * @throws Exception
	 *
	 * @return bool true on success, false if address already used or invalid in some way
	 */
	public function addCC($address, $name = '')
	{
		return $this->addOrEnqueueAnAddress('cc', $address, $name);
	}

	/**
	 * Add a "BCC" address.
	 *
	 * @param string $address The email address to send to
	 * @param string $name
	 *
	 * @throws Exception
	 *
	 * @return bool true on success, false if address already used or invalid in some way
	 */
	public function addBCC($address, $name = '')
	{
		return $this->addOrEnqueueAnAddress('bcc', $address, $name);
	}

	/**
	 * Add a "Reply-To" address.
	 *
	 * @param string $address The email address to reply to
	 * @param string $name
	 *
	 * @throws Exception
	 *
	 * @return bool true on success, false if address already used or invalid in some way
	 */
	public function addReplyTo($address, $name = '')
	{
		return $this->addOrEnqueueAnAddress('Reply-To', $address, $name);
	}

	/**
	 * Add an address to one of the recipient arrays or to the ReplyTo array. Because PHPMailer
	 * can't validate addresses with an IDN without knowing the PHPMailer::$CharSet (that can still
	 * be modified after calling this function), addition of such addresses is delayed until send().
	 * Addresses that have been added already return false, but do not throw exceptions.
	 *
	 * @param string $kind    One of 'to', 'cc', 'bcc', or 'ReplyTo'
	 * @param string $address The email address to send, resp. to reply to
	 * @param string $name
	 *
	 * @throws Exception
	 *
	 * @return bool true on success, false if address already used or invalid in some way
	 */
	protected function addOrEnqueueAnAddress($kind, $address, $name)
	{
		$address = trim($address);
		$name = trim(preg_replace('/[\r\n]+/', '', $name)); //Strip breaks and trim
		$pos = strrpos($address, '@');
		if (false === $pos) {
			// At-sign is missing.
			$error_message = sprintf(
				'%s (%s): %s',
				$this->lang('invalid_address'),
				$kind,
				$address
			);
			$this->setError($error_message);
			$this->edebug($error_message);
			if ($this->exceptions) {
				throw new Exception($error_message);
			}

			return false;
		}
		$params = [$kind, $address, $name];
		// Enqueue addresses with IDN until we know the PHPMailer::$CharSet.
		if (static::idnSupported() && $this->has8bitChars(substr($address, ++$pos))) {
			if ('Reply-To' !== $kind) {
				if (!array_key_exists($address, $this->RecipientsQueue)) {
					$this->RecipientsQueue[$address] = $params;

					return true;
				}
			} elseif (!array_key_exists($address, $this->ReplyToQueue)) {
				$this->ReplyToQueue[$address] = $params;

				return true;
			}

			return false;
		}

		// Immediately add standard addresses without IDN.
		return call_user_func_array([$this, 'addAnAddress'], $params);
	}

	/**
	 * Add an address to one of the recipient arrays or to the ReplyTo array.
	 * Addresses that have been added already return false, but do not throw exceptions.
	 *
	 * @param string $kind    One of 'to', 'cc', 'bcc', or 'ReplyTo'
	 * @param string $address The email address to send, resp. to reply to
	 * @param string $name
	 *
	 * @throws Exception
	 *
	 * @return bool true on success, false if address already used or invalid in some way
	 */
	protected function addAnAddress($kind, $address, $name = '')
	{
		if (!in_array($kind, ['to', 'cc', 'bcc', 'Reply-To'])) {
			$error_message = sprintf(
				'%s: %s',
				$this->lang('Invalid recipient kind'),
				$kind
			);
			$this->setError($error_message);
			$this->edebug($error_message);
			if ($this->exceptions) {
				throw new Exception($error_message);
			}

			return false;
		}
		if (!static::validateAddress($address)) {
			$error_message = sprintf(
				'%s (%s): %s',
				$this->lang('invalid_address'),
				$kind,
				$address
			);
			$this->setError($error_message);
			$this->edebug($error_message);
			if ($this->exceptions) {
				throw new Exception($error_message);
			}

			return false;
		}
		if ('Reply-To' !== $kind) {
			if (!array_key_exists(strtolower($address), $this->all_recipients)) {
				$this->{$kind}[] = [$address, $name];
				$this->all_recipients[strtolower($address)] = true;

				return true;
			}
		} elseif (!array_key_exists(strtolower($address), $this->ReplyTo)) {
			$this->ReplyTo[strtolower($address)] = [$address, $name];

			return true;
		}

		return false;
	}

	/**
	 * Parse and validate a string containing one or more RFC822-style comma-separated email addresses
	 * of the form "display name <address>" into an array of name/address pairs.
	 * Uses the imap_rfc822_parse_adrlist function if the IMAP extension is available.
	 * Note that quotes in the name part are removed.
	 *
	 * @see http://www.andrew.cmu.edu/user/agreen1/testing/mrbs/web/Mail/RFC822.php A more careful implementation
	 *
	 * @param string $addrstr The address list string
	 * @param bool   $useimap Whether to use the IMAP extension to parse the list
	 *
	 * @return array
	 */
	public static function parseAddresses($addrstr, $useimap = true)
	{
		$addresses = [];
		if ($useimap && function_exists('imap_rfc822_parse_adrlist')) {
			//Use this built-in parser if it's available
			$list = imap_rfc822_parse_adrlist($addrstr, '');
			foreach ($list as $address) {
				if (('.SYNTAX-ERROR.' !== $address->host) && static::validateAddress(
						$address->mailbox . '@' . $address->host
					)) {
					$addresses[] = [
						'name' => (property_exists($address, 'personal') ? $address->personal : ''),
						'address' => $address->mailbox . '@' . $address->host,
					];
				}
			}
		} else {
			//Use this simpler parser
			$list = explode(',', $addrstr);
			foreach ($list as $address) {
				$address = trim($address);
				//Is there a separate name part?
				if (strpos($address, '<') === false) {
					//No separate name, just use the whole thing
					if (static::validateAddress($address)) {
						$addresses[] = [
							'name' => '',
							'address' => $address,
						];
					}
				} else {
					list($name, $email) = explode('<', $address);
					$email = trim(str_replace('>', '', $email));
					if (static::validateAddress($email)) {
						$addresses[] = [
							'name' => trim(str_replace(['"', "'"], '', $name)),
							'address' => $email,
						];
					}
				}
			}
		}

		return $addresses;
	}

	/**
	 * Set the From and FromName properties.
	 *
	 * @param string $address
	 * @param string $name
	 * @param bool   $auto    Whether to also set the Sender address, defaults to true
	 *
	 * @throws Exception
	 *
	 * @return bool
	 */
	public function setFrom($address, $name = '', $auto = true)
	{
		$address = trim($address);
		$name = trim(preg_replace('/[\r\n]+/', '', $name)); //Strip breaks and trim
		// Don't validate now addresses with IDN. Will be done in send().
		$pos = strrpos($address, '@');
		if ((false === $pos)
			|| ((!$this->has8bitChars(substr($address, ++$pos)) || !static::idnSupported())
				&& !static::validateAddress($address))
		) {
			$error_message = sprintf(
				'%s (From): %s',
				$this->lang('invalid_address'),
				$address
			);
			$this->setError($error_message);
			$this->edebug($error_message);
			if ($this->exceptions) {
				throw new Exception($error_message);
			}

			return false;
		}
		$this->From = $address;
		$this->FromName = $name;
		if ($auto && empty($this->Sender)) {
			$this->Sender = $address;
		}

		return true;
	}

	/**
	 * Return the Message-ID header of the last email.
	 * Technically this is the value from the last time the headers were created,
	 * but it's also the message ID of the last sent message except in
	 * pathological cases.
	 *
	 * @return string
	 */
	public function getLastMessageID()
	{
		return $this->lastMessageID;
	}

	/**
	 * Check that a string looks like an email address.
	 * Validation patterns supported:
	 * * `auto` Pick best pattern automatically;
	 * * `pcre8` Use the squiloople.com pattern, requires PCRE > 8.0;
	 * * `pcre` Use old PCRE implementation;
	 * * `php` Use PHP built-in FILTER_VALIDATE_EMAIL;
	 * * `html5` Use the pattern given by the HTML5 spec for 'email' type form input elements.
	 * * `noregex` Don't use a regex: super fast, really dumb.
	 * Alternatively you may pass in a callable to inject your own validator, for example:
	 *
	 * ```php
	 * PHPMailer::validateAddress('user@example.com', function($address) {
	 *     return (strpos($address, '@') !== false);
	 * });
	 * ```
	 *
	 * You can also set the PHPMailer::$validator static to a callable, allowing built-in methods to use your validator.
	 *
	 * @param string          $address       The email address to check
	 * @param string|callable $patternselect Which pattern to use
	 *
	 * @return bool
	 */
	public static function validateAddress($address, $patternselect = null)
	{
		if (null === $patternselect) {
			$patternselect = static::$validator;
		}
		if (is_callable($patternselect)) {
			return $patternselect($address);
		}
		//Reject line breaks in addresses; it's valid RFC5322, but not RFC5321
		if (strpos($address, "\n") !== false || strpos($address, "\r") !== false) {
			return false;
		}
		switch ($patternselect) {
			case 'pcre': //Kept for BC
			case 'pcre8':
				/*
                 * A more complex and more permissive version of the RFC5322 regex on which FILTER_VALIDATE_EMAIL
                 * is based.
                 * In addition to the addresses allowed by filter_var, also permits:
                 *  * dotless domains: `a@b`
                 *  * comments: `1234 @ local(blah) .machine .example`
                 *  * quoted elements: `'"test blah"@example.org'`
                 *  * numeric TLDs: `a@b.123`
                 *  * unbracketed IPv4 literals: `a@192.168.0.1`
                 *  * IPv6 literals: 'first.last@[IPv6:a1::]'
                 * Not all of these will necessarily work for sending!
                 *
                 * @see       http://squiloople.com/2009/12/20/email-address-validation/
                 * @copyright 2009-2010 Michael Rushton
                 * Feel free to use and redistribute this code. But please keep this copyright notice.
                 */
				return (bool) preg_match(
					'/^(?!(?>(?1)"?(?>\\\[ -~]|[^"])"?(?1)){255,})(?!(?>(?1)"?(?>\\\[ -~]|[^"])"?(?1)){65,}@)' .
					'((?>(?>(?>((?>(?>(?>\x0D\x0A)?[\t ])+|(?>[\t ]*\x0D\x0A)?[\t ]+)?)(\((?>(?2)' .
					'(?>[\x01-\x08\x0B\x0C\x0E-\'*-\[\]-\x7F]|\\\[\x00-\x7F]|(?3)))*(?2)\)))+(?2))|(?2))?)' .
					'([!#-\'*+\/-9=?^-~-]+|"(?>(?2)(?>[\x01-\x08\x0B\x0C\x0E-!#-\[\]-\x7F]|\\\[\x00-\x7F]))*' .
					'(?2)")(?>(?1)\.(?1)(?4))*(?1)@(?!(?1)[a-z0-9-]{64,})(?1)(?>([a-z0-9](?>[a-z0-9-]*[a-z0-9])?)' .
					'(?>(?1)\.(?!(?1)[a-z0-9-]{64,})(?1)(?5)){0,126}|\[(?:(?>IPv6:(?>([a-f0-9]{1,4})(?>:(?6)){7}' .
					'|(?!(?:.*[a-f0-9][:\]]){8,})((?6)(?>:(?6)){0,6})?::(?7)?))|(?>(?>IPv6:(?>(?6)(?>:(?6)){5}:' .
					'|(?!(?:.*[a-f0-9]:){6,})(?8)?::(?>((?6)(?>:(?6)){0,4}):)?))?(25[0-5]|2[0-4][0-9]|1[0-9]{2}' .
					'|[1-9]?[0-9])(?>\.(?9)){3}))\])(?1)$/isD',
					$address
				);
			case 'html5':
				/*
                 * This is the pattern used in the HTML5 spec for validation of 'email' type form input elements.
                 *
                 * @see http://www.whatwg.org/specs/web-apps/current-work/#e-mail-state-(type=email)
                 */
				return (bool) preg_match(
					'/^[a-zA-Z0-9.!#$%&\'*+\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}' .
					'[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/sD',
					$address
				);
			case 'php':
			default:
				return (bool) filter_var($address, FILTER_VALIDATE_EMAIL);
		}
	}

	/**
	 * Tells whether IDNs (Internationalized Domain Names) are supported or not. This requires the
	 * `intl` and `mbstring` PHP extensions.
	 *
	 * @return bool `true` if required functions for IDN support are present
	 */
	public static function idnSupported()
	{
		return function_exists('idn_to_ascii') && function_exists('mb_convert_encoding');
	}

	/**
	 * Converts IDN in given email address to its ASCII form, also known as punycode, if possible.
	 * Important: Address must be passed in same encoding as currently set in PHPMailer::$CharSet.
	 * This function silently returns unmodified address if:
	 * - No conversion is necessary (i.e. domain name is not an IDN, or is already in ASCII form)
	 * - Conversion to punycode is impossible (e.g. required PHP functions are not available)
	 *   or fails for any reason (e.g. domain contains characters not allowed in an IDN).
	 *
	 * @see PHPMailer::$CharSet
	 *
	 * @param string $address The email address to convert
	 *
	 * @return string The encoded address in ASCII form
	 */
	public function punyencodeAddress($address)
	{
		// Verify we have required functions, CharSet, and at-sign.
		$pos = strrpos($address, '@');
		if (!empty($this->CharSet) &&
			false !== $pos &&
			static::idnSupported()
		) {
			$domain = substr($address, ++$pos);
			// Verify CharSet string is a valid one, and domain properly encoded in this CharSet.
			if ($this->has8bitChars($domain) && @mb_check_encoding($domain, $this->CharSet)) {
				$domain = mb_convert_encoding($domain, 'UTF-8', $this->CharSet);
				//Ignore IDE complaints about this line - method signature changed in PHP 5.4
				$errorcode = 0;
				$punycode = idn_to_ascii($domain, $errorcode, INTL_IDNA_VARIANT_UTS46);
				if (false !== $punycode) {
					return substr($address, 0, $pos) . $punycode;
				}
			}
		}

		return $address;
	}

	/**
	 * Create a message and send it.
	 * Uses the sending method specified by $Mailer.
	 *
	 * @throws Exception
	 *
	 * @return bool false on error - See the ErrorInfo property for details of the error
	 */
	public function send()
	{
		try {
			if (!$this->preSend()) {
				return false;
			}

			return $this->postSend();
		} catch (Exception $exc) {
			$this->mailHeader = '';
			$this->setError($exc->getMessage());
			if ($this->exceptions) {
				throw $exc;
			}

			return false;
		}
	}

	/**
	 * Prepare a message for sending.
	 *
	 * @throws Exception
	 *
	 * @return bool
	 */
	public function preSend()
	{
		if ('smtp' === $this->Mailer
			|| ('mail' === $this->Mailer && stripos(PHP_OS, 'WIN') === 0)
		) {
			//SMTP mandates RFC-compliant line endings
			//and it's also used with mail() on Windows
			static::setLE("\r\n");
		} else {
			//Maintain backward compatibility with legacy Linux command line mailers
			static::setLE(PHP_EOL);
		}
		//Check for buggy PHP versions that add a header with an incorrect line break
		if ('mail' === $this->Mailer
			&& ((PHP_VERSION_ID >= 70000 && PHP_VERSION_ID < 70017)
				|| (PHP_VERSION_ID >= 70100 && PHP_VERSION_ID < 70103))
			&& ini_get('mail.add_x_header') === '1'
			&& stripos(PHP_OS, 'WIN') === 0
		) {
			trigger_error(
				'Your version of PHP is affected by a bug that may result in corrupted messages.' .
				' To fix it, switch to sending using SMTP, disable the mail.add_x_header option in' .
				' your php.ini, switch to MacOS or Linux, or upgrade your PHP to version 7.0.17+ or 7.1.3+.',
				E_USER_WARNING
			);
		}

		try {
			$this->error_count = 0; // Reset errors
			$this->mailHeader = '';

			// Dequeue recipient and Reply-To addresses with IDN
			foreach (array_merge($this->RecipientsQueue, $this->ReplyToQueue) as $params) {
				$params[1] = $this->punyencodeAddress($params[1]);
				call_user_func_array([$this, 'addAnAddress'], $params);
			}
			if (count($this->to) + count($this->cc) + count($this->bcc) < 1) {
				throw new Exception($this->lang('provide_address'), self::STOP_CRITICAL);
			}

			// Validate From, Sender, and ConfirmReadingTo addresses
			foreach (['From', 'Sender', 'ConfirmReadingTo'] as $address_kind) {
				$this->$address_kind = trim($this->$address_kind);
				if (empty($this->$address_kind)) {
					continue;
				}
				$this->$address_kind = $this->punyencodeAddress($this->$address_kind);
				if (!static::validateAddress($this->$address_kind)) {
					$error_message = sprintf(
						'%s (%s): %s',
						$this->lang('invalid_address'),
						$address_kind,
						$this->$address_kind
					);
					$this->setError($error_message);
					$this->edebug($error_message);
					if ($this->exceptions) {
						throw new Exception($error_message);
					}

					return false;
				}
			}

			// Set whether the message is multipart/alternative
			if ($this->alternativeExists()) {
				$this->ContentType = static::CONTENT_TYPE_MULTIPART_ALTERNATIVE;
			}

			$this->setMessageType();
			// Refuse to send an empty message unless we are specifically allowing it
			if (!$this->AllowEmpty && empty($this->Body)) {
				throw new Exception($this->lang('empty_message'), self::STOP_CRITICAL);
			}

			//Trim subject consistently
			$this->Subject = trim($this->Subject);
			// Create body before headers in case body makes changes to headers (e.g. altering transfer encoding)
			$this->MIMEHeader = '';
			$this->MIMEBody = $this->createBody();
			// createBody may have added some headers, so retain them
			$tempheaders = $this->MIMEHeader;
			$this->MIMEHeader = $this->createHeader();
			$this->MIMEHeader .= $tempheaders;

			// To capture the complete message when using mail(), create
			// an extra header list which createHeader() doesn't fold in
			if ('mail' === $this->Mailer) {
				if (count($this->to) > 0) {
					$this->mailHeader .= $this->addrAppend('To', $this->to);
				} else {
					$this->mailHeader .= $this->headerLine('To', 'undisclosed-recipients:;');
				}
				$this->mailHeader .= $this->headerLine(
					'Subject',
					$this->encodeHeader($this->secureHeader($this->Subject))
				);
			}

			// Sign with DKIM if enabled
			if (!empty($this->DKIM_domain)
				&& !empty($this->DKIM_selector)
				&& (!empty($this->DKIM_private_string)
					|| (!empty($this->DKIM_private)
						&& static::isPermittedPath($this->DKIM_private)
						&& file_exists($this->DKIM_private)
					)
				)
			) {
				$header_dkim = $this->DKIM_Add(
					$this->MIMEHeader . $this->mailHeader,
					$this->encodeHeader($this->secureHeader($this->Subject)),
					$this->MIMEBody
				);
				$this->MIMEHeader = rtrim($this->MIMEHeader, "\r\n ") . static::$LE .
					static::normalizeBreaks($header_dkim) . static::$LE;
			}

			return true;
		} catch (Exception $exc) {
			$this->setError($exc->getMessage());
			if ($this->exceptions) {
				throw $exc;
			}

			return false;
		}
	}

	/**
	 * Actually send a message via the selected mechanism.
	 *
	 * @throws Exception
	 *
	 * @return bool
	 */
	public function postSend()
	{
		try {
			// Choose the mailer and send through it
			switch ($this->Mailer) {
				case 'sendmail':
				case 'qmail':
					return $this->sendmailSend($this->MIMEHeader, $this->MIMEBody);
				case 'smtp':
					return $this->smtpSend($this->MIMEHeader, $this->MIMEBody);
				case 'mail':
					return $this->mailSend($this->MIMEHeader, $this->MIMEBody);
				default:
					$sendMethod = $this->Mailer . 'Send';
					if (method_exists($this, $sendMethod)) {
						return $this->$sendMethod($this->MIMEHeader, $this->MIMEBody);
					}

					return $this->mailSend($this->MIMEHeader, $this->MIMEBody);
			}
		} catch (Exception $exc) {
			$this->setError($exc->getMessage());
			$this->edebug($exc->getMessage());
			if ($this->exceptions) {
				throw $exc;
			}
		}

		return false;
	}

	/**
	 * Send mail using the $Sendmail program.
	 *
	 * @see PHPMailer::$Sendmail
	 *
	 * @param string $header The message headers
	 * @param string $body   The message body
	 *
	 * @throws Exception
	 *
	 * @return bool
	 */
	protected function sendmailSend($header, $body)
	{
		// CVE-2016-10033, CVE-2016-10045: Don't pass -f if characters will be escaped.
		if (!empty($this->Sender) && self::isShellSafe($this->Sender)) {
			if ('qmail' === $this->Mailer) {
				$sendmailFmt = '%s -f%s';
			} else {
				$sendmailFmt = '%s -oi -f%s -t';
			}
		} elseif ('qmail' === $this->Mailer) {
			$sendmailFmt = '%s';
		} else {
			$sendmailFmt = '%s -oi -t';
		}

		$sendmail = sprintf($sendmailFmt, escapeshellcmd($this->Sendmail), $this->Sender);

		if ($this->SingleTo) {
			foreach ($this->SingleToArray as $toAddr) {
				$mail = @popen($sendmail, 'w');
				if (!$mail) {
					throw new Exception($this->lang('execute') . $this->Sendmail, self::STOP_CRITICAL);
				}
				fwrite($mail, 'To: ' . $toAddr . "\n");
				fwrite($mail, $header);
				fwrite($mail, $body);
				$result = pclose($mail);
				$this->doCallback(
					($result === 0),
					[$toAddr],
					$this->cc,
					$this->bcc,
					$this->Subject,
					$body,
					$this->From,
					[]
				);
				if (0 !== $result) {
					throw new Exception($this->lang('execute') . $this->Sendmail, self::STOP_CRITICAL);
				}
			}
		} else {
			$mail = @popen($sendmail, 'w');
			if (!$mail) {
				throw new Exception($this->lang('execute') . $this->Sendmail, self::STOP_CRITICAL);
			}
			fwrite($mail, $header);
			fwrite($mail, $body);
			$result = pclose($mail);
			$this->doCallback(
				($result === 0),
				$this->to,
				$this->cc,
				$this->bcc,
				$this->Subject,
				$body,
				$this->From,
				[]
			);
			if (0 !== $result) {
				throw new Exception($this->lang('execute') . $this->Sendmail, self::STOP_CRITICAL);
			}
		}

		return true;
	}

	/**
	 * Fix CVE-2016-10033 and CVE-2016-10045 by disallowing potentially unsafe shell characters.
	 * Note that escapeshellarg and escapeshellcmd are inadequate for our purposes, especially on Windows.
	 *
	 * @see https://github.com/PHPMailer/PHPMailer/issues/924 CVE-2016-10045 bug report
	 *
	 * @param string $string The string to be validated
	 *
	 * @return bool
	 */
	protected static function isShellSafe($string)
	{
		// Future-proof
		if (escapeshellcmd($string) !== $string
			|| !in_array(escapeshellarg($string), ["'$string'", "\"$string\""])
		) {
			return false;
		}

		$length = strlen($string);

		for ($i = 0; $i < $length; ++$i) {
			$c = $string[$i];

			// All other characters have a special meaning in at least one common shell, including = and +.
			// Full stop (.) has a special meaning in cmd.exe, but its impact should be negligible here.
			// Note that this does permit non-Latin alphanumeric characters based on the current locale.
			if (!ctype_alnum($c) && strpos('@_-.', $c) === false) {
				return false;
			}
		}

		return true;
	}

	/**
	 * Check whether a file path is of a permitted type.
	 * Used to reject URLs and phar files from functions that access local file paths,
	 * such as addAttachment.
	 *
	 * @param string $path A relative or absolute path to a file
	 *
	 * @return bool
	 */
	protected static function isPermittedPath($path)
	{
		return !preg_match('#^[a-z]+://#i', $path);
	}

	/**
	 * Send mail using the PHP mail() function.
	 *
	 * @see http://www.php.net/manual/en/book.mail.php
	 *
	 * @param string $header The message headers
	 * @param string $body   The message body
	 *
	 * @throws Exception
	 *
	 * @return bool
	 */
	protected function mailSend($header, $body)
	{
		$toArr = [];
		foreach ($this->to as $toaddr) {
			$toArr[] = $this->addrFormat($toaddr);
		}
		$to = implode(', ', $toArr);

		$params = null;
		//This sets the SMTP envelope sender which gets turned into a return-path header by the receiver
		//A space after `-f` is optional, but there is a long history of its presence
		//causing problems, so we don't use one
		//Exim docs: http://www.exim.org/exim-html-current/doc/html/spec_html/ch-the_exim_command_line.html
		//Sendmail docs: http://www.sendmail.org/~ca/email/man/sendmail.html
		//Qmail docs: http://www.qmail.org/man/man8/qmail-inject.html
		//Example problem: https://www.drupal.org/node/1057954
		// CVE-2016-10033, CVE-2016-10045: Don't pass -f if characters will be escaped.
		if (!empty($this->Sender) && static::validateAddress($this->Sender) && self::isShellSafe($this->Sender)) {
			$params = sprintf('-f%s', $this->Sender);
		}
		if (!empty($this->Sender) && static::validateAddress($this->Sender)) {
			$old_from = ini_get('sendmail_from');
			ini_set('sendmail_from', $this->Sender);
		}
		$result = false;
		if ($this->SingleTo && count($toArr) > 1) {
			foreach ($toArr as $toAddr) {
				$result = $this->mailPassthru($toAddr, $this->Subject, $body, $header, $params);
				$this->doCallback($result, [$toAddr], $this->cc, $this->bcc, $this->Subject, $body, $this->From, []);
			}
		} else {
			$result = $this->mailPassthru($to, $this->Subject, $body, $header, $params);
			$this->doCallback($result, $this->to, $this->cc, $this->bcc, $this->Subject, $body, $this->From, []);
		}
		if (isset($old_from)) {
			ini_set('sendmail_from', $old_from);
		}
		if (!$result) {
			throw new Exception($this->lang('instantiate'), self::STOP_CRITICAL);
		}

		return true;
	}

	/**
	 * Get an instance to use for SMTP operations.
	 * Override this function to load your own SMTP implementation,
	 * or set one with setSMTPInstance.
	 *
	 * @return SMTP
	 */
	public function getSMTPInstance()
	{
		if (!is_object($this->smtp)) {
			$this->smtp = new SMTP();
		}

		return $this->smtp;
	}

	/**
	 * Provide an instance to use for SMTP operations.
	 *
	 * @param SMTP $smtp
	 *
	 * @return SMTP
	 */
	public function setSMTPInstance(SMTP $smtp)
	{
		$this->smtp = $smtp;

		return $this->smtp;
	}

	/**
	 * Send mail via SMTP.
	 * Returns false if there is a bad MAIL FROM, RCPT, or DATA input.
	 *
	 * @see PHPMailer::setSMTPInstance() to use a different class.
	 *
	 * @uses \PHPMailer\PHPMailer\SMTP
	 *
	 * @param string $header The message headers
	 * @param string $body   The message body
	 *
	 * @throws Exception
	 *
	 * @return bool
	 */
	protected function smtpSend($header, $body)
	{
		$bad_rcpt = [];
		if (!$this->smtpConnect($this->SMTPOptions)) {
			throw new Exception($this->lang('smtp_connect_failed'), self::STOP_CRITICAL);
		}
		//Sender already validated in preSend()
		if ('' === $this->Sender) {
			$smtp_from = $this->From;
		} else {
			$smtp_from = $this->Sender;
		}
		if (!$this->smtp->mail($smtp_from)) {
			$this->setError($this->lang('from_failed') . $smtp_from . ' : ' . implode(',', $this->smtp->getError()));
			throw new Exception($this->ErrorInfo, self::STOP_CRITICAL);
		}

		$callbacks = [];
		// Attempt to send to all recipients
		foreach ([$this->to, $this->cc, $this->bcc] as $togroup) {
			foreach ($togroup as $to) {
				if (!$this->smtp->recipient($to[0], $this->dsn)) {
					$error = $this->smtp->getError();
					$bad_rcpt[] = ['to' => $to[0], 'error' => $error['detail']];
					$isSent = false;
				} else {
					$isSent = true;
				}

				$callbacks[] = ['issent'=>$isSent, 'to'=>$to[0]];
			}
		}

		// Only send the DATA command if we have viable recipients
		if ((count($this->all_recipients) > count($bad_rcpt)) && !$this->smtp->data($header . $body)) {
			throw new Exception($this->lang('data_not_accepted'), self::STOP_CRITICAL);
		}

		$smtp_transaction_id = $this->smtp->getLastTransactionID();

		if ($this->SMTPKeepAlive) {
			$this->smtp->reset();
		} else {
			$this->smtp->quit();
			$this->smtp->close();
		}

		foreach ($callbacks as $cb) {
			$this->doCallback(
				$cb['issent'],
				[$cb['to']],
				[],
				[],
				$this->Subject,
				$body,
				$this->From,
				['smtp_transaction_id' => $smtp_transaction_id]
			);
		}

		//Create error message for any bad addresses
		if (count($bad_rcpt) > 0) {
			$errstr = '';
			foreach ($bad_rcpt as $bad) {
				$errstr .= $bad['to'] . ': ' . $bad['error'];
			}
			throw new Exception(
				$this->lang('recipients_failed') . $errstr,
				self::STOP_CONTINUE
			);
		}

		return true;
	}

	/**
	 * Initiate a connection to an SMTP server.
	 * Returns false if the operation failed.
	 *
	 * @param array $options An array of options compatible with stream_context_create()
	 *
	 * @throws Exception
	 *
	 * @uses \PHPMailer\PHPMailer\SMTP
	 *
	 * @return bool
	 */
	public function smtpConnect($options = null)
	{
		if (null === $this->smtp) {
			$this->smtp = $this->getSMTPInstance();
		}

		//If no options are provided, use whatever is set in the instance
		if (null === $options) {
			$options = $this->SMTPOptions;
		}

		// Already connected?
		if ($this->smtp->connected()) {
			return true;
		}

		$this->smtp->setTimeout($this->Timeout);
		$this->smtp->setDebugLevel($this->SMTPDebug);
		$this->smtp->setDebugOutput($this->Debugoutput);
		$this->smtp->setVerp($this->do_verp);
		$hosts = explode(';', $this->Host);
		$lastexception = null;

		foreach ($hosts as $hostentry) {
			$hostinfo = [];
			if (!preg_match(
				'/^((ssl|tls):\/\/)*([a-zA-Z\d.-]*|\[[a-fA-F\d:]+]):?(\d*)$/',
				trim($hostentry),
				$hostinfo
			)) {
				$this->edebug($this->lang('connect_host') . ' ' . $hostentry);
				// Not a valid host entry
				continue;
			}
			// $hostinfo[2]: optional ssl or tls prefix
			// $hostinfo[3]: the hostname
			// $hostinfo[4]: optional port number
			// The host string prefix can temporarily override the current setting for SMTPSecure
			// If it's not specified, the default value is used

			//Check the host name is a valid name or IP address before trying to use it
			if (!static::isValidHost($hostinfo[3])) {
				$this->edebug($this->lang('connect_host') . ' ' . $hostentry);
				continue;
			}
			$prefix = '';
			$secure = $this->SMTPSecure;
			$tls = (static::ENCRYPTION_STARTTLS === $this->SMTPSecure);
			if ('ssl' === $hostinfo[2] || ('' === $hostinfo[2] && static::ENCRYPTION_SMTPS === $this->SMTPSecure)) {
				$prefix = 'ssl://';
				$tls = false; // Can't have SSL and TLS at the same time
				$secure = static::ENCRYPTION_SMTPS;
			} elseif ('tls' === $hostinfo[2]) {
				$tls = true;
				// tls doesn't use a prefix
				$secure = static::ENCRYPTION_STARTTLS;
			}
			//Do we need the OpenSSL extension?
			$sslext = defined('OPENSSL_ALGO_SHA256');
			if (static::ENCRYPTION_STARTTLS === $secure || static::ENCRYPTION_SMTPS === $secure) {
				//Check for an OpenSSL constant rather than using extension_loaded, which is sometimes disabled
				if (!$sslext) {
					throw new Exception($this->lang('extension_missing') . 'openssl', self::STOP_CRITICAL);
				}
			}
			$host = $hostinfo[3];
			$port = $this->Port;
			$tport = (int) $hostinfo[4];
			if ($tport > 0 && $tport < 65536) {
				$port = $tport;
			}
			if ($this->smtp->connect($prefix . $host, $port, $this->Timeout, $options)) {
				try {
					if ($this->Helo) {
						$hello = $this->Helo;
					} else {
						$hello = $this->serverHostname();
					}
					$this->smtp->hello($hello);
					//Automatically enable TLS encryption if:
					// * it's not disabled
					// * we have openssl extension
					// * we are not already using SSL
					// * the server offers STARTTLS
					if ($this->SMTPAutoTLS && $sslext && 'ssl' !== $secure && $this->smtp->getServerExt('STARTTLS')) {
						$tls = true;
					}
					if ($tls) {
						if (!$this->smtp->startTLS()) {
							throw new Exception($this->lang('connect_host'));
						}
						// We must resend EHLO after TLS negotiation
						$this->smtp->hello($hello);
					}
					if ($this->SMTPAuth && !$this->smtp->authenticate(
							$this->Username,
							$this->Password,
							$this->AuthType,
							$this->oauth
						)) {
						throw new Exception($this->lang('authenticate'));
					}

					return true;
				} catch (Exception $exc) {
					$lastexception = $exc;
					$this->edebug($exc->getMessage());
					// We must have connected, but then failed TLS or Auth, so close connection nicely
					$this->smtp->quit();
				}
			}
		}
		// If we get here, all connection attempts have failed, so close connection hard
		$this->smtp->close();
		// As we've caught all exceptions, just report whatever the last one was
		if ($this->exceptions && null !== $lastexception) {
			throw $lastexception;
		}

		return false;
	}

	/**
	 * Close the active SMTP session if one exists.
	 */
	public function smtpClose()
	{
		if ((null !== $this->smtp) && $this->smtp->connected()) {
			$this->smtp->quit();
			$this->smtp->close();
		}
	}

	/**
	 * Set the language for error messages.
	 * Returns false if it cannot load the language file.
	 * The default language is English.
	 *
	 * @param string $langcode  ISO 639-1 2-character language code (e.g. French is "fr")
	 * @param string $lang_path Path to the language file directory, with trailing separator (slash)
	 *
	 * @return bool
	 */
	public function setLanguage($langcode = 'en', $lang_path = '')
	{
		// Backwards compatibility for renamed language codes
		$renamed_langcodes = [
			'br' => 'pt_br',
			'cz' => 'cs',
			'dk' => 'da',
			'no' => 'nb',
			'se' => 'sv',
			'rs' => 'sr',
			'tg' => 'tl',
		];

		if (isset($renamed_langcodes[$langcode])) {
			$langcode = $renamed_langcodes[$langcode];
		}

		// Define full set of translatable strings in English
		$PHPMAILER_LANG = [
			'authenticate' => 'SMTP Error: Could not authenticate.',
			'connect_host' => 'SMTP Error: Could not connect to SMTP host.',
			'data_not_accepted' => 'SMTP Error: data not accepted.',
			'empty_message' => 'Message body empty',
			'encoding' => 'Unknown encoding: ',
			'execute' => 'Could not execute: ',
			'file_access' => 'Could not access file: ',
			'file_open' => 'File Error: Could not open file: ',
			'from_failed' => 'The following From address failed: ',
			'instantiate' => 'Could not instantiate mail function.',
			'invalid_address' => 'Invalid address: ',
			'mailer_not_supported' => ' mailer is not supported.',
			'provide_address' => 'You must provide at least one recipient email address.',
			'recipients_failed' => 'SMTP Error: The following recipients failed: ',
			'signing' => 'Signing Error: ',
			'smtp_connect_failed' => 'SMTP connect() failed.',
			'smtp_error' => 'SMTP server error: ',
			'variable_set' => 'Cannot set or reset variable: ',
			'extension_missing' => 'Extension missing: ',
		];
		if (empty($lang_path)) {
			// Calculate an absolute path so it can work if CWD is not here
			$lang_path = dirname(__DIR__) . DIRECTORY_SEPARATOR . 'language' . DIRECTORY_SEPARATOR;
		}
		//Validate $langcode
		if (!preg_match('/^[a-z]{2}(?:_[a-zA-Z]{2})?$/', $langcode)) {
			$langcode = 'en';
		}
		$foundlang = true;
		$lang_file = $lang_path . 'phpmailer.lang-' . $langcode . '.php';
		// There is no English translation file
		if ('en' !== $langcode) {
			// Make sure language file path is readable
			if (!static::isPermittedPath($lang_file) || !file_exists($lang_file)) {
				$foundlang = false;
			} else {
				// Overwrite language-specific strings.
				// This way we'll never have missing translation keys.
				$foundlang = include $lang_file;
			}
		}
		$this->language = $PHPMAILER_LANG;

		return (bool) $foundlang; // Returns false if language not found
	}

	/**
	 * Get the array of strings for the current language.
	 *
	 * @return array
	 */
	public function getTranslations()
	{
		return $this->language;
	}

	/**
	 * Create recipient headers.
	 *
	 * @param string $type
	 * @param array  $addr An array of recipients,
	 *                     where each recipient is a 2-element indexed array with element 0 containing an address
	 *                     and element 1 containing a name, like:
	 *                     [['joe@example.com', 'Joe User'], ['zoe@example.com', 'Zoe User']]
	 *
	 * @return string
	 */
	public function addrAppend($type, $addr)
	{
		$addresses = [];
		foreach ($addr as $address) {
			$addresses[] = $this->addrFormat($address);
		}

		return $type . ': ' . implode(', ', $addresses) . static::$LE;
	}

	/**
	 * Format an address for use in a message header.
	 *
	 * @param array $addr A 2-element indexed array, element 0 containing an address, element 1 containing a name like
	 *                    ['joe@example.com', 'Joe User']
	 *
	 * @return string
	 */
	public function addrFormat($addr)
	{
		if (empty($addr[1])) { // No name provided
			return $this->secureHeader($addr[0]);
		}

		return $this->encodeHeader($this->secureHeader($addr[1]), 'phrase') .
			' <' . $this->secureHeader($addr[0]) . '>';
	}

	/**
	 * Word-wrap message.
	 * For use with mailers that do not automatically perform wrapping
	 * and for quoted-printable encoded messages.
	 * Original written by philippe.
	 *
	 * @param string $message The message to wrap
	 * @param int    $length  The line length to wrap to
	 * @param bool   $qp_mode Whether to run in Quoted-Printable mode
	 *
	 * @return string
	 */
	public function wrapText($message, $length, $qp_mode = false)
	{
		if ($qp_mode) {
			$soft_break = sprintf(' =%s', static::$LE);
		} else {
			$soft_break = static::$LE;
		}
		// If utf-8 encoding is used, we will need to make sure we don't
		// split multibyte characters when we wrap
		$is_utf8 = static::CHARSET_UTF8 === strtolower($this->CharSet);
		$lelen = strlen(static::$LE);
		$crlflen = strlen(static::$LE);

		$message = static::normalizeBreaks($message);
		//Remove a trailing line break
		if (substr($message, -$lelen) === static::$LE) {
			$message = substr($message, 0, -$lelen);
		}

		//Split message into lines
		$lines = explode(static::$LE, $message);
		//Message will be rebuilt in here
		$message = '';
		foreach ($lines as $line) {
			$words = explode(' ', $line);
			$buf = '';
			$firstword = true;
			foreach ($words as $word) {
				if ($qp_mode && (strlen($word) > $length)) {
					$space_left = $length - strlen($buf) - $crlflen;
					if (!$firstword) {
						if ($space_left > 20) {
							$len = $space_left;
							if ($is_utf8) {
								$len = $this->utf8CharBoundary($word, $len);
							} elseif ('=' === substr($word, $len - 1, 1)) {
								--$len;
							} elseif ('=' === substr($word, $len - 2, 1)) {
								$len -= 2;
							}
							$part = substr($word, 0, $len);
							$word = substr($word, $len);
							$buf .= ' ' . $part;
							$message .= $buf . sprintf('=%s', static::$LE);
						} else {
							$message .= $buf . $soft_break;
						}
						$buf = '';
					}
					while ($word !== '') {
						if ($length <= 0) {
							break;
						}
						$len = $length;
						if ($is_utf8) {
							$len = $this->utf8CharBoundary($word, $len);
						} elseif ('=' === substr($word, $len - 1, 1)) {
							--$len;
						} elseif ('=' === substr($word, $len - 2, 1)) {
							$len -= 2;
						}
						$part = substr($word, 0, $len);
						$word = (string) substr($word, $len);

						if ($word !== '') {
							$message .= $part . sprintf('=%s', static::$LE);
						} else {
							$buf = $part;
						}
					}
				} else {
					$buf_o = $buf;
					if (!$firstword) {
						$buf .= ' ';
					}
					$buf .= $word;

					if ('' !== $buf_o && strlen($buf) > $length) {
						$message .= $buf_o . $soft_break;
						$buf = $word;
					}
				}
				$firstword = false;
			}
			$message .= $buf . static::$LE;
		}

		return $message;
	}

	/**
	 * Find the last character boundary prior to $maxLength in a utf-8
	 * quoted-printable encoded string.
	 * Original written by Colin Brown.
	 *
	 * @param string $encodedText utf-8 QP text
	 * @param int    $maxLength   Find the last character boundary prior to this length
	 *
	 * @return int
	 */
	public function utf8CharBoundary($encodedText, $maxLength)
	{
		$foundSplitPos = false;
		$lookBack = 3;
		while (!$foundSplitPos) {
			$lastChunk = substr($encodedText, $maxLength - $lookBack, $lookBack);
			$encodedCharPos = strpos($lastChunk, '=');
			if (false !== $encodedCharPos) {
				// Found start of encoded character byte within $lookBack block.
				// Check the encoded byte value (the 2 chars after the '=')
				$hex = substr($encodedText, $maxLength - $lookBack + $encodedCharPos + 1, 2);
				$dec = hexdec($hex);
				if ($dec < 128) {
					// Single byte character.
					// If the encoded char was found at pos 0, it will fit
					// otherwise reduce maxLength to start of the encoded char
					if ($encodedCharPos > 0) {
						$maxLength -= $lookBack - $encodedCharPos;
					}
					$foundSplitPos = true;
				} elseif ($dec >= 192) {
					// First byte of a multi byte character
					// Reduce maxLength to split at start of character
					$maxLength -= $lookBack - $encodedCharPos;
					$foundSplitPos = true;
				} elseif ($dec < 192) {
					// Middle byte of a multi byte character, look further back
					$lookBack += 3;
				}
			} else {
				// No encoded character found
				$foundSplitPos = true;
			}
		}

		return $maxLength;
	}

	/**
	 * Apply word wrapping to the message body.
	 * Wraps the message body to the number of chars set in the WordWrap property.
	 * You should only do this to plain-text bodies as wrapping HTML tags may break them.
	 * This is called automatically by createBody(), so you don't need to call it yourself.
	 */
	public function setWordWrap()
	{
		if ($this->WordWrap < 1) {
			return;
		}

		switch ($this->message_type) {
			case 'alt':
			case 'alt_inline':
			case 'alt_attach':
			case 'alt_inline_attach':
				$this->AltBody = $this->wrapText($this->AltBody, $this->WordWrap);
				break;
			default:
				$this->Body = $this->wrapText($this->Body, $this->WordWrap);
				break;
		}
	}

	/**
	 * Assemble message headers.
	 *
	 * @return string The assembled headers
	 */
	public function createHeader()
	{
		$result = '';

		$result .= $this->headerLine('Date', '' === $this->MessageDate ? self::rfcDate() : $this->MessageDate);

		// To be created automatically by mail()
		if ($this->SingleTo) {
			if ('mail' !== $this->Mailer) {
				foreach ($this->to as $toaddr) {
					$this->SingleToArray[] = $this->addrFormat($toaddr);
				}
			}
		} elseif (count($this->to) > 0) {
			if ('mail' !== $this->Mailer) {
				$result .= $this->addrAppend('To', $this->to);
			}
		} elseif (count($this->cc) === 0) {
			$result .= $this->headerLine('To', 'undisclosed-recipients:;');
		}

		$result .= $this->addrAppend('From', [[trim($this->From), $this->FromName]]);

		// sendmail and mail() extract Cc from the header before sending
		if (count($this->cc) > 0) {
			$result .= $this->addrAppend('Cc', $this->cc);
		}

		// sendmail and mail() extract Bcc from the header before sending
		if ((
				'sendmail' === $this->Mailer || 'qmail' === $this->Mailer || 'mail' === $this->Mailer
			)
			&& count($this->bcc) > 0
		) {
			$result .= $this->addrAppend('Bcc', $this->bcc);
		}

		if (count($this->ReplyTo) > 0) {
			$result .= $this->addrAppend('Reply-To', $this->ReplyTo);
		}

		// mail() sets the subject itself
		if ('mail' !== $this->Mailer) {
			$result .= $this->headerLine('Subject', $this->encodeHeader($this->secureHeader($this->Subject)));
		}

		// Only allow a custom message ID if it conforms to RFC 5322 section 3.6.4
		// https://tools.ietf.org/html/rfc5322#section-3.6.4
		if ('' !== $this->MessageID && preg_match('/^<.*@.*>$/', $this->MessageID)) {
			$this->lastMessageID = $this->MessageID;
		} else {
			$this->lastMessageID = sprintf('<%s@%s>', $this->uniqueid, $this->serverHostname());
		}
		$result .= $this->headerLine('Message-ID', $this->lastMessageID);
		if (null !== $this->Priority) {
			$result .= $this->headerLine('X-Priority', $this->Priority);
		}
		if ('' === $this->XMailer) {
			$result .= $this->headerLine(
				'X-Mailer',
				'PHPMailer ' . self::VERSION . ' (https://github.com/PHPMailer/PHPMailer)'
			);
		} else {
			$myXmailer = trim($this->XMailer);
			if ($myXmailer) {
				$result .= $this->headerLine('X-Mailer', $myXmailer);
			}
		}

		if ('' !== $this->ConfirmReadingTo) {
			$result .= $this->headerLine('Disposition-Notification-To', '<' . $this->ConfirmReadingTo . '>');
		}

		// Add custom headers
		foreach ($this->CustomHeader as $header) {
			$result .= $this->headerLine(
				trim($header[0]),
				$this->encodeHeader(trim($header[1]))
			);
		}
		if (!$this->sign_key_file) {
			$result .= $this->headerLine('MIME-Version', '1.0');
			$result .= $this->getMailMIME();
		}

		return $result;
	}

	/**
	 * Get the message MIME type headers.
	 *
	 * @return string
	 */
	public function getMailMIME()
	{
		$result = '';
		$ismultipart = true;
		switch ($this->message_type) {
			case 'inline':
				$result .= $this->headerLine('Content-Type', static::CONTENT_TYPE_MULTIPART_RELATED . ';');
				$result .= $this->textLine(' boundary="' . $this->boundary[1] . '"');
				break;
			case 'attach':
			case 'inline_attach':
			case 'alt_attach':
			case 'alt_inline_attach':
				$result .= $this->headerLine('Content-Type', static::CONTENT_TYPE_MULTIPART_MIXED . ';');
				$result .= $this->textLine(' boundary="' . $this->boundary[1] . '"');
				break;
			case 'alt':
			case 'alt_inline':
				$result .= $this->headerLine('Content-Type', static::CONTENT_TYPE_MULTIPART_ALTERNATIVE . ';');
				$result .= $this->textLine(' boundary="' . $this->boundary[1] . '"');
				break;
			default:
				// Catches case 'plain': and case '':
				$result .= $this->textLine('Content-Type: ' . $this->ContentType . '; charset=' . $this->CharSet);
				$ismultipart = false;
				break;
		}
		// RFC1341 part 5 says 7bit is assumed if not specified
		if (static::ENCODING_7BIT !== $this->Encoding) {
			// RFC 2045 section 6.4 says multipart MIME parts may only use 7bit, 8bit or binary CTE
			if ($ismultipart) {
				if (static::ENCODING_8BIT === $this->Encoding) {
					$result .= $this->headerLine('Content-Transfer-Encoding', static::ENCODING_8BIT);
				}
				// The only remaining alternatives are quoted-printable and base64, which are both 7bit compatible
			} else {
				$result .= $this->headerLine('Content-Transfer-Encoding', $this->Encoding);
			}
		}

		if ('mail' !== $this->Mailer) {
			$result .= static::$LE;
		}

		return $result;
	}

	/**
	 * Returns the whole MIME message.
	 * Includes complete headers and body.
	 * Only valid post preSend().
	 *
	 * @see PHPMailer::preSend()
	 *
	 * @return string
	 */
	public function getSentMIMEMessage()
	{
		return rtrim($this->MIMEHeader . $this->mailHeader, "\n\r") . static::$LE . static::$LE . $this->MIMEBody;
	}

	/**
	 * Create a unique ID to use for boundaries.
	 *
	 * @return string
	 */
	protected function generateId()
	{
		$len = 32; //32 bytes = 256 bits
		$bytes = '';
		if (function_exists('random_bytes')) {
			try {
				$bytes = random_bytes($len);
			} catch (\Exception $e) {
				//Do nothing
			}
		} elseif (function_exists('openssl_random_pseudo_bytes')) {
			/** @noinspection CryptographicallySecureRandomnessInspection */
			$bytes = openssl_random_pseudo_bytes($len);
		}
		if ($bytes === '') {
			//We failed to produce a proper random string, so make do.
			//Use a hash to force the length to the same as the other methods
			$bytes = hash('sha256', uniqid((string) mt_rand(), true), true);
		}

		//We don't care about messing up base64 format here, just want a random string
		return str_replace(['=', '+', '/'], '', base64_encode(hash('sha256', $bytes, true)));
	}

	/**
	 * Assemble the message body.
	 * Returns an empty string on failure.
	 *
	 * @throws Exception
	 *
	 * @return string The assembled message body
	 */
	public function createBody()
	{
		$body = '';
		//Create unique IDs and preset boundaries
		$this->uniqueid = $this->generateId();
		$this->boundary[1] = 'b1_' . $this->uniqueid;
		$this->boundary[2] = 'b2_' . $this->uniqueid;
		$this->boundary[3] = 'b3_' . $this->uniqueid;

		if ($this->sign_key_file) {
			$body .= $this->getMailMIME() . static::$LE;
		}

		$this->setWordWrap();

		$bodyEncoding = $this->Encoding;
		$bodyCharSet = $this->CharSet;
		//Can we do a 7-bit downgrade?
		if (static::ENCODING_8BIT === $bodyEncoding && !$this->has8bitChars($this->Body)) {
			$bodyEncoding = static::ENCODING_7BIT;
			//All ISO 8859, Windows codepage and UTF-8 charsets are ascii compatible up to 7-bit
			$bodyCharSet = static::CHARSET_ASCII;
		}
		//If lines are too long, and we're not already using an encoding that will shorten them,
		//change to quoted-printable transfer encoding for the body part only
		if (static::ENCODING_BASE64 !== $this->Encoding && static::hasLineLongerThanMax($this->Body)) {
			$bodyEncoding = static::ENCODING_QUOTED_PRINTABLE;
		}

		$altBodyEncoding = $this->Encoding;
		$altBodyCharSet = $this->CharSet;
		//Can we do a 7-bit downgrade?
		if (static::ENCODING_8BIT === $altBodyEncoding && !$this->has8bitChars($this->AltBody)) {
			$altBodyEncoding = static::ENCODING_7BIT;
			//All ISO 8859, Windows codepage and UTF-8 charsets are ascii compatible up to 7-bit
			$altBodyCharSet = static::CHARSET_ASCII;
		}
		//If lines are too long, and we're not already using an encoding that will shorten them,
		//change to quoted-printable transfer encoding for the alt body part only
		if (static::ENCODING_BASE64 !== $altBodyEncoding && static::hasLineLongerThanMax($this->AltBody)) {
			$altBodyEncoding = static::ENCODING_QUOTED_PRINTABLE;
		}
		//Use this as a preamble in all multipart message types
		$mimepre = 'This is a multi-part message in MIME format.' . static::$LE;
		switch ($this->message_type) {
			case 'inline':
				$body .= $mimepre;
				$body .= $this->getBoundary($this->boundary[1], $bodyCharSet, '', $bodyEncoding);
				$body .= $this->encodeString($this->Body, $bodyEncoding);
				$body .= static::$LE;
				$body .= $this->attachAll('inline', $this->boundary[1]);
				break;
			case 'attach':
				$body .= $mimepre;
				$body .= $this->getBoundary($this->boundary[1], $bodyCharSet, '', $bodyEncoding);
				$body .= $this->encodeString($this->Body, $bodyEncoding);
				$body .= static::$LE;
				$body .= $this->attachAll('attachment', $this->boundary[1]);
				break;
			case 'inline_attach':
				$body .= $mimepre;
				$body .= $this->textLine('--' . $this->boundary[1]);
				$body .= $this->headerLine('Content-Type', static::CONTENT_TYPE_MULTIPART_RELATED . ';');
				$body .= $this->textLine(' boundary="' . $this->boundary[2] . '";');
				$body .= $this->textLine(' type="' . static::CONTENT_TYPE_TEXT_HTML . '"');
				$body .= static::$LE;
				$body .= $this->getBoundary($this->boundary[2], $bodyCharSet, '', $bodyEncoding);
				$body .= $this->encodeString($this->Body, $bodyEncoding);
				$body .= static::$LE;
				$body .= $this->attachAll('inline', $this->boundary[2]);
				$body .= static::$LE;
				$body .= $this->attachAll('attachment', $this->boundary[1]);
				break;
			case 'alt':
				$body .= $mimepre;
				$body .= $this->getBoundary(
					$this->boundary[1],
					$altBodyCharSet,
					static::CONTENT_TYPE_PLAINTEXT,
					$altBodyEncoding
				);
				$body .= $this->encodeString($this->AltBody, $altBodyEncoding);
				$body .= static::$LE;
				$body .= $this->getBoundary(
					$this->boundary[1],
					$bodyCharSet,
					static::CONTENT_TYPE_TEXT_HTML,
					$bodyEncoding
				);
				$body .= $this->encodeString($this->Body, $bodyEncoding);
				$body .= static::$LE;
				if (!empty($this->Ical)) {
					$method = static::ICAL_METHOD_REQUEST;
					foreach (static::$IcalMethods as $imethod) {
						if (stripos($this->Ical, 'METHOD:' . $imethod) !== false) {
							$method = $imethod;
							break;
						}
					}
					$body .= $this->getBoundary(
						$this->boundary[1],
						'',
						static::CONTENT_TYPE_TEXT_CALENDAR . '; method=' . $method,
						''
					);
					$body .= $this->encodeString($this->Ical, $this->Encoding);
					$body .= static::$LE;
				}
				$body .= $this->endBoundary($this->boundary[1]);
				break;
			case 'alt_inline':
				$body .= $mimepre;
				$body .= $this->getBoundary(
					$this->boundary[1],
					$altBodyCharSet,
					static::CONTENT_TYPE_PLAINTEXT,
					$altBodyEncoding
				);
				$body .= $this->encodeString($this->AltBody, $altBodyEncoding);
				$body .= static::$LE;
				$body .= $this->textLine('--' . $this->boundary[1]);
				$body .= $this->headerLine('Content-Type', static::CONTENT_TYPE_MULTIPART_RELATED . ';');
				$body .= $this->textLine(' boundary="' . $this->boundary[2] . '";');
				$body .= $this->textLine(' type="' . static::CONTENT_TYPE_TEXT_HTML . '"');
				$body .= static::$LE;
				$body .= $this->getBoundary(
					$this->boundary[2],
					$bodyCharSet,
					static::CONTENT_TYPE_TEXT_HTML,
					$bodyEncoding
				);
				$body .= $this->encodeString($this->Body, $bodyEncoding);
				$body .= static::$LE;
				$body .= $this->attachAll('inline', $this->boundary[2]);
				$body .= static::$LE;
				$body .= $this->endBoundary($this->boundary[1]);
				break;
			case 'alt_attach':
				$body .= $mimepre;
				$body .= $this->textLine('--' . $this->boundary[1]);
				$body .= $this->headerLine('Content-Type', static::CONTENT_TYPE_MULTIPART_ALTERNATIVE . ';');
				$body .= $this->textLine(' boundary="' . $this->boundary[2] . '"');
				$body .= static::$LE;
				$body .= $this->getBoundary(
					$this->boundary[2],
					$altBodyCharSet,
					static::CONTENT_TYPE_PLAINTEXT,
					$altBodyEncoding
				);
				$body .= $this->encodeString($this->AltBody, $altBodyEncoding);
				$body .= static::$LE;
				$body .= $this->getBoundary(
					$this->boundary[2],
					$bodyCharSet,
					static::CONTENT_TYPE_TEXT_HTML,
					$bodyEncoding
				);
				$body .= $this->encodeString($this->Body, $bodyEncoding);
				$body .= static::$LE;
				if (!empty($this->Ical)) {
					$method = static::ICAL_METHOD_REQUEST;
					foreach (static::$IcalMethods as $imethod) {
						if (stripos($this->Ical, 'METHOD:' . $imethod) !== false) {
							$method = $imethod;
							break;
						}
					}
					$body .= $this->getBoundary(
						$this->boundary[2],
						'',
						static::CONTENT_TYPE_TEXT_CALENDAR . '; method=' . $method,
						''
					);
					$body .= $this->encodeString($this->Ical, $this->Encoding);
				}
				$body .= $this->endBoundary($this->boundary[2]);
				$body .= static::$LE;
				$body .= $this->attachAll('attachment', $this->boundary[1]);
				break;
			case 'alt_inline_attach':
				$body .= $mimepre;
				$body .= $this->textLine('--' . $this->boundary[1]);
				$body .= $this->headerLine('Content-Type', static::CONTENT_TYPE_MULTIPART_ALTERNATIVE . ';');
				$body .= $this->textLine(' boundary="' . $this->boundary[2] . '"');
				$body .= static::$LE;
				$body .= $this->getBoundary(
					$this->boundary[2],
					$altBodyCharSet,
					static::CONTENT_TYPE_PLAINTEXT,
					$altBodyEncoding
				);
				$body .= $this->encodeString($this->AltBody, $altBodyEncoding);
				$body .= static::$LE;
				$body .= $this->textLine('--' . $this->boundary[2]);
				$body .= $this->headerLine('Content-Type', static::CONTENT_TYPE_MULTIPART_RELATED . ';');
				$body .= $this->textLine(' boundary="' . $this->boundary[3] . '";');
				$body .= $this->textLine(' type="' . static::CONTENT_TYPE_TEXT_HTML . '"');
				$body .= static::$LE;
				$body .= $this->getBoundary(
					$this->boundary[3],
					$bodyCharSet,
					static::CONTENT_TYPE_TEXT_HTML,
					$bodyEncoding
				);
				$body .= $this->encodeString($this->Body, $bodyEncoding);
				$body .= static::$LE;
				$body .= $this->attachAll('inline', $this->boundary[3]);
				$body .= static::$LE;
				$body .= $this->endBoundary($this->boundary[2]);
				$body .= static::$LE;
				$body .= $this->attachAll('attachment', $this->boundary[1]);
				break;
			default:
				// Catch case 'plain' and case '', applies to simple `text/plain` and `text/html` body content types
				//Reset the `Encoding` property in case we changed it for line length reasons
				$this->Encoding = $bodyEncoding;
				$body .= $this->encodeString($this->Body, $this->Encoding);
				break;
		}

		if ($this->isError()) {
			$body = '';
			if ($this->exceptions) {
				throw new Exception($this->lang('empty_message'), self::STOP_CRITICAL);
			}
		} elseif ($this->sign_key_file) {
			try {
				if (!defined('PKCS7_TEXT')) {
					throw new Exception($this->lang('extension_missing') . 'openssl');
				}

				$file = tempnam(sys_get_temp_dir(), 'srcsign');
				$signed = tempnam(sys_get_temp_dir(), 'mailsign');
				file_put_contents($file, $body);

				//Workaround for PHP bug https://bugs.php.net/bug.php?id=69197
				if (empty($this->sign_extracerts_file)) {
					$sign = @openssl_pkcs7_sign(
						$file,
						$signed,
						'file://' . realpath($this->sign_cert_file),
						['file://' . realpath($this->sign_key_file), $this->sign_key_pass],
						[]
					);
				} else {
					$sign = @openssl_pkcs7_sign(
						$file,
						$signed,
						'file://' . realpath($this->sign_cert_file),
						['file://' . realpath($this->sign_key_file), $this->sign_key_pass],
						[],
						PKCS7_DETACHED,
						$this->sign_extracerts_file
					);
				}

				@unlink($file);
				if ($sign) {
					$body = file_get_contents($signed);
					@unlink($signed);
					//The message returned by openssl contains both headers and body, so need to split them up
					$parts = explode("\n\n", $body, 2);
					$this->MIMEHeader .= $parts[0] . static::$LE . static::$LE;
					$body = $parts[1];
				} else {
					@unlink($signed);
					throw new Exception($this->lang('signing') . openssl_error_string());
				}
			} catch (Exception $exc) {
				$body = '';
				if ($this->exceptions) {
					throw $exc;
				}
			}
		}

		return $body;
	}

	/**
	 * Return the start of a message boundary.
	 *
	 * @param string $boundary
	 * @param string $charSet
	 * @param string $contentType
	 * @param string $encoding
	 *
	 * @return string
	 */
	protected function getBoundary($boundary, $charSet, $contentType, $encoding)
	{
		$result = '';
		if ('' === $charSet) {
			$charSet = $this->CharSet;
		}
		if ('' === $contentType) {
			$contentType = $this->ContentType;
		}
		if ('' === $encoding) {
			$encoding = $this->Encoding;
		}
		$result .= $this->textLine('--' . $boundary);
		$result .= sprintf('Content-Type: %s; charset=%s', $contentType, $charSet);
		$result .= static::$LE;
		// RFC1341 part 5 says 7bit is assumed if not specified
		if (static::ENCODING_7BIT !== $encoding) {
			$result .= $this->headerLine('Content-Transfer-Encoding', $encoding);
		}
		$result .= static::$LE;

		return $result;
	}

	/**
	 * Return the end of a message boundary.
	 *
	 * @param string $boundary
	 *
	 * @return string
	 */
	protected function endBoundary($boundary)
	{
		return static::$LE . '--' . $boundary . '--' . static::$LE;
	}

	/**
	 * Set the message type.
	 * PHPMailer only supports some preset message types, not arbitrary MIME structures.
	 */
	protected function setMessageType()
	{
		$type = [];
		if ($this->alternativeExists()) {
			$type[] = 'alt';
		}
		if ($this->inlineImageExists()) {
			$type[] = 'inline';
		}
		if ($this->attachmentExists()) {
			$type[] = 'attach';
		}
		$this->message_type = implode('_', $type);
		if ('' === $this->message_type) {
			//The 'plain' message_type refers to the message having a single body element, not that it is plain-text
			$this->message_type = 'plain';
		}
	}

	/**
	 * Format a header line.
	 *
	 * @param string     $name
	 * @param string|int $value
	 *
	 * @return string
	 */
	public function headerLine($name, $value)
	{
		return $name . ': ' . $value . static::$LE;
	}

	/**
	 * Return a formatted mail line.
	 *
	 * @param string $value
	 *
	 * @return string
	 */
	public function textLine($value)
	{
		return $value . static::$LE;
	}

	/**
	 * Add an attachment from a path on the filesystem.
	 * Never use a user-supplied path to a file!
	 * Returns false if the file could not be found or read.
	 * Explicitly *does not* support passing URLs; PHPMailer is not an HTTP client.
	 * If you need to do that, fetch the resource yourself and pass it in via a local file or string.
	 *
	 * @param string $path        Path to the attachment
	 * @param string $name        Overrides the attachment name
	 * @param string $encoding    File encoding (see $Encoding)
	 * @param string $type        File extension (MIME) type
	 * @param string $disposition Disposition to use
	 *
	 * @throws Exception
	 *
	 * @return bool
	 */
	public function addAttachment(
		$path,
		$name = '',
		$encoding = self::ENCODING_BASE64,
		$type = '',
		$disposition = 'attachment'
	) {
		try {
			if (!static::isPermittedPath($path) || !@is_file($path)) {
				throw new Exception($this->lang('file_access') . $path, self::STOP_CONTINUE);
			}

			// If a MIME type is not specified, try to work it out from the file name
			if ('' === $type) {
				$type = static::filenameToType($path);
			}

			$filename = (string) static::mb_pathinfo($path, PATHINFO_BASENAME);
			if ('' === $name) {
				$name = $filename;
			}

			if (!$this->validateEncoding($encoding)) {
				throw new Exception($this->lang('encoding') . $encoding);
			}

			$this->attachment[] = [
				0 => $path,
				1 => $filename,
				2 => $name,
				3 => $encoding,
				4 => $type,
				5 => false, // isStringAttachment
				6 => $disposition,
				7 => $name,
			];
		} catch (Exception $exc) {
			$this->setError($exc->getMessage());
			$this->edebug($exc->getMessage());
			if ($this->exceptions) {
				throw $exc;
			}

			return false;
		}

		return true;
	}

	/**
	 * Return the array of attachments.
	 *
	 * @return array
	 */
	public function getAttachments()
	{
		return $this->attachment;
	}

	/**
	 * Attach all file, string, and binary attachments to the message.
	 * Returns an empty string on failure.
	 *
	 * @param string $disposition_type
	 * @param string $boundary
	 *
	 * @throws Exception
	 *
	 * @return string
	 */
	protected function attachAll($disposition_type, $boundary)
	{
		// Return text of body
		$mime = [];
		$cidUniq = [];
		$incl = [];

		// Add all attachments
		foreach ($this->attachment as $attachment) {
			// Check if it is a valid disposition_filter
			if ($attachment[6] === $disposition_type) {
				// Check for string attachment
				$string = '';
				$path = '';
				$bString = $attachment[5];
				if ($bString) {
					$string = $attachment[0];
				} else {
					$path = $attachment[0];
				}

				$inclhash = hash('sha256', serialize($attachment));
				if (in_array($inclhash, $incl, true)) {
					continue;
				}
				$incl[] = $inclhash;
				$name = $attachment[2];
				$encoding = $attachment[3];
				$type = $attachment[4];
				$disposition = $attachment[6];
				$cid = $attachment[7];
				if ('inline' === $disposition && array_key_exists($cid, $cidUniq)) {
					continue;
				}
				$cidUniq[$cid] = true;

				$mime[] = sprintf('--%s%s', $boundary, static::$LE);
				//Only include a filename property if we have one
				if (!empty($name)) {
					$mime[] = sprintf(
						'Content-Type: %s; name="%s"%s',
						$type,
						$this->encodeHeader($this->secureHeader($name)),
						static::$LE
					);
				} else {
					$mime[] = sprintf(
						'Content-Type: %s%s',
						$type,
						static::$LE
					);
				}
				// RFC1341 part 5 says 7bit is assumed if not specified
				if (static::ENCODING_7BIT !== $encoding) {
					$mime[] = sprintf('Content-Transfer-Encoding: %s%s', $encoding, static::$LE);
				}

				if (!empty($cid)) {
					$mime[] = 'Content-ID: ' . $this->encodeHeader('<' . $this->secureHeader($cid) . '>') . static::$LE;
				}

				// If a filename contains any of these chars, it should be quoted,
				// but not otherwise: RFC2183 & RFC2045 5.1
				// Fixes a warning in IETF's msglint MIME checker
				// Allow for bypassing the Content-Disposition header totally
				if (!empty($disposition)) {
					$encoded_name = $this->encodeHeader($this->secureHeader($name));
					if (preg_match('/[ ()<>@,;:"\/\[\]?=]/', $encoded_name)) {
						$mime[] = sprintf(
							'Content-Disposition: %s; filename="%s"%s',
							$disposition,
							$encoded_name,
							static::$LE . static::$LE
						);
					} elseif (!empty($encoded_name)) {
						$mime[] = sprintf(
							'Content-Disposition: %s; filename=%s%s',
							$disposition,
							$encoded_name,
							static::$LE . static::$LE
						);
					} else {
						$mime[] = sprintf(
							'Content-Disposition: %s%s',
							$disposition,
							static::$LE . static::$LE
						);
					}
				} else {
					$mime[] = static::$LE;
				}

				// Encode as string attachment
				if ($bString) {
					$mime[] = $this->encodeString($string, $encoding);
				} else {
					$mime[] = $this->encodeFile($path, $encoding);
				}
				if ($this->isError()) {
					return '';
				}
				$mime[] = static::$LE;
			}
		}

		$mime[] = sprintf('--%s--%s', $boundary, static::$LE);

		return implode('', $mime);
	}

	/**
	 * Encode a file attachment in requested format.
	 * Returns an empty string on failure.
	 *
	 * @param string $path     The full path to the file
	 * @param string $encoding The encoding to use; one of 'base64', '7bit', '8bit', 'binary', 'quoted-printable'
	 *
	 * @return string
	 */
	protected function encodeFile($path, $encoding = self::ENCODING_BASE64)
	{
		try {
			if (!static::isPermittedPath($path) || !file_exists($path)) {
				throw new Exception($this->lang('file_open') . $path, self::STOP_CONTINUE);
			}
			$file_buffer = file_get_contents($path);
			if (false === $file_buffer) {
				throw new Exception($this->lang('file_open') . $path, self::STOP_CONTINUE);
			}
			$file_buffer = $this->encodeString($file_buffer, $encoding);

			return $file_buffer;
		} catch (Exception $exc) {
			$this->setError($exc->getMessage());

			return '';
		}
	}

	/**
	 * Encode a string in requested format.
	 * Returns an empty string on failure.
	 *
	 * @param string $str      The text to encode
	 * @param string $encoding The encoding to use; one of 'base64', '7bit', '8bit', 'binary', 'quoted-printable'
	 *
	 * @throws Exception
	 *
	 * @return string
	 */
	public function encodeString($str, $encoding = self::ENCODING_BASE64)
	{
		$encoded = '';
		switch (strtolower($encoding)) {
			case static::ENCODING_BASE64:
				$encoded = chunk_split(
					base64_encode($str),
					static::STD_LINE_LENGTH,
					static::$LE
				);
				break;
			case static::ENCODING_7BIT:
			case static::ENCODING_8BIT:
				$encoded = static::normalizeBreaks($str);
				// Make sure it ends with a line break
				if (substr($encoded, -(strlen(static::$LE))) !== static::$LE) {
					$encoded .= static::$LE;
				}
				break;
			case static::ENCODING_BINARY:
				$encoded = $str;
				break;
			case static::ENCODING_QUOTED_PRINTABLE:
				$encoded = $this->encodeQP($str);
				break;
			default:
				$this->setError($this->lang('encoding') . $encoding);
				if ($this->exceptions) {
					throw new Exception($this->lang('encoding') . $encoding);
				}
				break;
		}

		return $encoded;
	}

	/**
	 * Encode a header value (not including its label) optimally.
	 * Picks shortest of Q, B, or none. Result includes folding if needed.
	 * See RFC822 definitions for phrase, comment and text positions.
	 *
	 * @param string $str      The header value to encode
	 * @param string $position What context the string will be used in
	 *
	 * @return string
	 */
	public function encodeHeader($str, $position = 'text')
	{
		$matchcount = 0;
		switch (strtolower($position)) {
			case 'phrase':
				if (!preg_match('/[\200-\377]/', $str)) {
					// Can't use addslashes as we don't know the value of magic_quotes_sybase
					$encoded = addcslashes($str, "\0..\37\177\\\"");
					if (($str === $encoded) && !preg_match('/[^A-Za-z0-9!#$%&\'*+\/=?^_`{|}~ -]/', $str)) {
						return $encoded;
					}

					return "\"$encoded\"";
				}
				$matchcount = preg_match_all('/[^\040\041\043-\133\135-\176]/', $str, $matches);
				break;
			/* @noinspection PhpMissingBreakStatementInspection */
			case 'comment':
				$matchcount = preg_match_all('/[()"]/', $str, $matches);
			//fallthrough
			case 'text':
			default:
				$matchcount += preg_match_all('/[\000-\010\013\014\016-\037\177-\377]/', $str, $matches);
				break;
		}

		if ($this->has8bitChars($str)) {
			$charset = $this->CharSet;
		} else {
			$charset = static::CHARSET_ASCII;
		}

		// Q/B encoding adds 8 chars and the charset ("` =?<charset>?[QB]?<content>?=`").
		$overhead = 8 + strlen($charset);

		if ('mail' === $this->Mailer) {
			$maxlen = static::MAIL_MAX_LINE_LENGTH - $overhead;
		} else {
			$maxlen = static::STD_LINE_LENGTH - $overhead;
		}

		// Select the encoding that produces the shortest output and/or prevents corruption.
		if ($matchcount > strlen($str) / 3) {
			// More than 1/3 of the content needs encoding, use B-encode.
			$encoding = 'B';
		} elseif ($matchcount > 0) {
			// Less than 1/3 of the content needs encoding, use Q-encode.
			$encoding = 'Q';
		} elseif (strlen($str) > $maxlen) {
			// No encoding needed, but value exceeds max line length, use Q-encode to prevent corruption.
			$encoding = 'Q';
		} else {
			// No reformatting needed
			$encoding = false;
		}

		switch ($encoding) {
			case 'B':
				if ($this->hasMultiBytes($str)) {
					// Use a custom function which correctly encodes and wraps long
					// multibyte strings without breaking lines within a character
					$encoded = $this->base64EncodeWrapMB($str, "\n");
				} else {
					$encoded = base64_encode($str);
					$maxlen -= $maxlen % 4;
					$encoded = trim(chunk_split($encoded, $maxlen, "\n"));
				}
				$encoded = preg_replace('/^(.*)$/m', ' =?' . $charset . "?$encoding?\\1?=", $encoded);
				break;
			case 'Q':
				$encoded = $this->encodeQ($str, $position);
				$encoded = $this->wrapText($encoded, $maxlen, true);
				$encoded = str_replace('=' . static::$LE, "\n", trim($encoded));
				$encoded = preg_replace('/^(.*)$/m', ' =?' . $charset . "?$encoding?\\1?=", $encoded);
				break;
			default:
				return $str;
		}

		return trim(static::normalizeBreaks($encoded));
	}

	/**
	 * Check if a string contains multi-byte characters.
	 *
	 * @param string $str multi-byte text to wrap encode
	 *
	 * @return bool
	 */
	public function hasMultiBytes($str)
	{
		if (function_exists('mb_strlen')) {
			return strlen($str) > mb_strlen($str, $this->CharSet);
		}

		// Assume no multibytes (we can't handle without mbstring functions anyway)
		return false;
	}

	/**
	 * Does a string contain any 8-bit chars (in any charset)?
	 *
	 * @param string $text
	 *
	 * @return bool
	 */
	public function has8bitChars($text)
	{
		return (bool) preg_match('/[\x80-\xFF]/', $text);
	}

	/**
	 * Encode and wrap long multibyte strings for mail headers
	 * without breaking lines within a character.
	 * Adapted from a function by paravoid.
	 *
	 * @see http://www.php.net/manual/en/function.mb-encode-mimeheader.php#60283
	 *
	 * @param string $str       multi-byte text to wrap encode
	 * @param string $linebreak string to use as linefeed/end-of-line
	 *
	 * @return string
	 */
	public function base64EncodeWrapMB($str, $linebreak = null)
	{
		$start = '=?' . $this->CharSet . '?B?';
		$end = '?=';
		$encoded = '';
		if (null === $linebreak) {
			$linebreak = static::$LE;
		}

		$mb_length = mb_strlen($str, $this->CharSet);
		// Each line must have length <= 75, including $start and $end
		$length = 75 - strlen($start) - strlen($end);
		// Average multi-byte ratio
		$ratio = $mb_length / strlen($str);
		// Base64 has a 4:3 ratio
		$avgLength = floor($length * $ratio * .75);

		$offset = 0;
		for ($i = 0; $i < $mb_length; $i += $offset) {
			$lookBack = 0;
			do {
				$offset = $avgLength - $lookBack;
				$chunk = mb_substr($str, $i, $offset, $this->CharSet);
				$chunk = base64_encode($chunk);
				++$lookBack;
			} while (strlen($chunk) > $length);
			$encoded .= $chunk . $linebreak;
		}

		// Chomp the last linefeed
		return substr($encoded, 0, -strlen($linebreak));
	}

	/**
	 * Encode a string in quoted-printable format.
	 * According to RFC2045 section 6.7.
	 *
	 * @param string $string The text to encode
	 *
	 * @return string
	 */
	public function encodeQP($string)
	{
		return static::normalizeBreaks(quoted_printable_encode($string));
	}

	/**
	 * Encode a string using Q encoding.
	 *
	 * @see http://tools.ietf.org/html/rfc2047#section-4.2
	 *
	 * @param string $str      the text to encode
	 * @param string $position Where the text is going to be used, see the RFC for what that means
	 *
	 * @return string
	 */
	public function encodeQ($str, $position = 'text')
	{
		// There should not be any EOL in the string
		$pattern = '';
		$encoded = str_replace(["\r", "\n"], '', $str);
		switch (strtolower($position)) {
			case 'phrase':
				// RFC 2047 section 5.3
				$pattern = '^A-Za-z0-9!*+\/ -';
				break;
			/*
             * RFC 2047 section 5.2.
             * Build $pattern without including delimiters and []
             */
			/* @noinspection PhpMissingBreakStatementInspection */
			case 'comment':
				$pattern = '\(\)"';
			/* Intentional fall through */
			case 'text':
			default:
				// RFC 2047 section 5.1
				// Replace every high ascii, control, =, ? and _ characters
				$pattern = '\000-\011\013\014\016-\037\075\077\137\177-\377' . $pattern;
				break;
		}
		$matches = [];
		if (preg_match_all("/[{$pattern}]/", $encoded, $matches)) {
			// If the string contains an '=', make sure it's the first thing we replace
			// so as to avoid double-encoding
			$eqkey = array_search('=', $matches[0], true);
			if (false !== $eqkey) {
				unset($matches[0][$eqkey]);
				array_unshift($matches[0], '=');
			}
			foreach (array_unique($matches[0]) as $char) {
				$encoded = str_replace($char, '=' . sprintf('%02X', ord($char)), $encoded);
			}
		}
		// Replace spaces with _ (more readable than =20)
		// RFC 2047 section 4.2(2)
		return str_replace(' ', '_', $encoded);
	}

	/**
	 * Add a string or binary attachment (non-filesystem).
	 * This method can be used to attach ascii or binary data,
	 * such as a BLOB record from a database.
	 *
	 * @param string $string      String attachment data
	 * @param string $filename    Name of the attachment
	 * @param string $encoding    File encoding (see $Encoding)
	 * @param string $type        File extension (MIME) type
	 * @param string $disposition Disposition to use
	 *
	 * @throws Exception
	 *
	 * @return bool True on successfully adding an attachment
	 */
	public function addStringAttachment(
		$string,
		$filename,
		$encoding = self::ENCODING_BASE64,
		$type = '',
		$disposition = 'attachment'
	) {
		try {
			// If a MIME type is not specified, try to work it out from the file name
			if ('' === $type) {
				$type = static::filenameToType($filename);
			}

			if (!$this->validateEncoding($encoding)) {
				throw new Exception($this->lang('encoding') . $encoding);
			}

			// Append to $attachment array
			$this->attachment[] = [
				0 => $string,
				1 => $filename,
				2 => static::mb_pathinfo($filename, PATHINFO_BASENAME),
				3 => $encoding,
				4 => $type,
				5 => true, // isStringAttachment
				6 => $disposition,
				7 => 0,
			];
		} catch (Exception $exc) {
			$this->setError($exc->getMessage());
			$this->edebug($exc->getMessage());
			if ($this->exceptions) {
				throw $exc;
			}

			return false;
		}

		return true;
	}

	/**
	 * Add an embedded (inline) attachment from a file.
	 * This can include images, sounds, and just about any other document type.
	 * These differ from 'regular' attachments in that they are intended to be
	 * displayed inline with the message, not just attached for download.
	 * This is used in HTML messages that embed the images
	 * the HTML refers to using the $cid value.
	 * Never use a user-supplied path to a file!
	 *
	 * @param string $path        Path to the attachment
	 * @param string $cid         Content ID of the attachment; Use this to reference
	 *                            the content when using an embedded image in HTML
	 * @param string $name        Overrides the attachment name
	 * @param string $encoding    File encoding (see $Encoding)
	 * @param string $type        File MIME type
	 * @param string $disposition Disposition to use
	 *
	 * @throws Exception
	 *
	 * @return bool True on successfully adding an attachment
	 */
	public function addEmbeddedImage(
		$path,
		$cid,
		$name = '',
		$encoding = self::ENCODING_BASE64,
		$type = '',
		$disposition = 'inline'
	) {
		try {
			if (!static::isPermittedPath($path) || !@is_file($path)) {
				throw new Exception($this->lang('file_access') . $path, self::STOP_CONTINUE);
			}

			// If a MIME type is not specified, try to work it out from the file name
			if ('' === $type) {
				$type = static::filenameToType($path);
			}

			if (!$this->validateEncoding($encoding)) {
				throw new Exception($this->lang('encoding') . $encoding);
			}

			$filename = (string) static::mb_pathinfo($path, PATHINFO_BASENAME);
			if ('' === $name) {
				$name = $filename;
			}

			// Append to $attachment array
			$this->attachment[] = [
				0 => $path,
				1 => $filename,
				2 => $name,
				3 => $encoding,
				4 => $type,
				5 => false, // isStringAttachment
				6 => $disposition,
				7 => $cid,
			];
		} catch (Exception $exc) {
			$this->setError($exc->getMessage());
			$this->edebug($exc->getMessage());
			if ($this->exceptions) {
				throw $exc;
			}

			return false;
		}

		return true;
	}

	/**
	 * Add an embedded stringified attachment.
	 * This can include images, sounds, and just about any other document type.
	 * If your filename doesn't contain an extension, be sure to set the $type to an appropriate MIME type.
	 *
	 * @param string $string      The attachment binary data
	 * @param string $cid         Content ID of the attachment; Use this to reference
	 *                            the content when using an embedded image in HTML
	 * @param string $name        A filename for the attachment. If this contains an extension,
	 *                            PHPMailer will attempt to set a MIME type for the attachment.
	 *                            For example 'file.jpg' would get an 'image/jpeg' MIME type.
	 * @param string $encoding    File encoding (see $Encoding), defaults to 'base64'
	 * @param string $type        MIME type - will be used in preference to any automatically derived type
	 * @param string $disposition Disposition to use
	 *
	 * @throws Exception
	 *
	 * @return bool True on successfully adding an attachment
	 */
	public function addStringEmbeddedImage(
		$string,
		$cid,
		$name = '',
		$encoding = self::ENCODING_BASE64,
		$type = '',
		$disposition = 'inline'
	) {
		try {
			// If a MIME type is not specified, try to work it out from the name
			if ('' === $type && !empty($name)) {
				$type = static::filenameToType($name);
			}

			if (!$this->validateEncoding($encoding)) {
				throw new Exception($this->lang('encoding') . $encoding);
			}

			// Append to $attachment array
			$this->attachment[] = [
				0 => $string,
				1 => $name,
				2 => $name,
				3 => $encoding,
				4 => $type,
				5 => true, // isStringAttachment
				6 => $disposition,
				7 => $cid,
			];
		} catch (Exception $exc) {
			$this->setError($exc->getMessage());
			$this->edebug($exc->getMessage());
			if ($this->exceptions) {
				throw $exc;
			}

			return false;
		}

		return true;
	}

	/**
	 * Validate encodings.
	 *
	 * @param string $encoding
	 *
	 * @return bool
	 */
	protected function validateEncoding($encoding)
	{
		return in_array(
			$encoding,
			[
				self::ENCODING_7BIT,
				self::ENCODING_QUOTED_PRINTABLE,
				self::ENCODING_BASE64,
				self::ENCODING_8BIT,
				self::ENCODING_BINARY,
			],
			true
		);
	}

	/**
	 * Check if an embedded attachment is present with this cid.
	 *
	 * @param string $cid
	 *
	 * @return bool
	 */
	protected function cidExists($cid)
	{
		foreach ($this->attachment as $attachment) {
			if ('inline' === $attachment[6] && $cid === $attachment[7]) {
				return true;
			}
		}

		return false;
	}

	/**
	 * Check if an inline attachment is present.
	 *
	 * @return bool
	 */
	public function inlineImageExists()
	{
		foreach ($this->attachment as $attachment) {
			if ('inline' === $attachment[6]) {
				return true;
			}
		}

		return false;
	}

	/**
	 * Check if an attachment (non-inline) is present.
	 *
	 * @return bool
	 */
	public function attachmentExists()
	{
		foreach ($this->attachment as $attachment) {
			if ('attachment' === $attachment[6]) {
				return true;
			}
		}

		return false;
	}

	/**
	 * Check if this message has an alternative body set.
	 *
	 * @return bool
	 */
	public function alternativeExists()
	{
		return !empty($this->AltBody);
	}

	/**
	 * Clear queued addresses of given kind.
	 *
	 * @param string $kind 'to', 'cc', or 'bcc'
	 */
	public function clearQueuedAddresses($kind)
	{
		$this->RecipientsQueue = array_filter(
			$this->RecipientsQueue,
			static function ($params) use ($kind) {
				return $params[0] !== $kind;
			}
		);
	}

	/**
	 * Clear all To recipients.
	 */
	public function clearAddresses()
	{
		foreach ($this->to as $to) {
			unset($this->all_recipients[strtolower($to[0])]);
		}
		$this->to = [];
		$this->clearQueuedAddresses('to');
	}

	/**
	 * Clear all CC recipients.
	 */
	public function clearCCs()
	{
		foreach ($this->cc as $cc) {
			unset($this->all_recipients[strtolower($cc[0])]);
		}
		$this->cc = [];
		$this->clearQueuedAddresses('cc');
	}

	/**
	 * Clear all BCC recipients.
	 */
	public function clearBCCs()
	{
		foreach ($this->bcc as $bcc) {
			unset($this->all_recipients[strtolower($bcc[0])]);
		}
		$this->bcc = [];
		$this->clearQueuedAddresses('bcc');
	}

	/**
	 * Clear all ReplyTo recipients.
	 */
	public function clearReplyTos()
	{
		$this->ReplyTo = [];
		$this->ReplyToQueue = [];
	}

	/**
	 * Clear all recipient types.
	 */
	public function clearAllRecipients()
	{
		$this->to = [];
		$this->cc = [];
		$this->bcc = [];
		$this->all_recipients = [];
		$this->RecipientsQueue = [];
	}

	/**
	 * Clear all filesystem, string, and binary attachments.
	 */
	public function clearAttachments()
	{
		$this->attachment = [];
	}

	/**
	 * Clear all custom headers.
	 */
	public function clearCustomHeaders()
	{
		$this->CustomHeader = [];
	}

	/**
	 * Add an error message to the error container.
	 *
	 * @param string $msg
	 */
	protected function setError($msg)
	{
		++$this->error_count;
		if ('smtp' === $this->Mailer && null !== $this->smtp) {
			$lasterror = $this->smtp->getError();
			if (!empty($lasterror['error'])) {
				$msg .= $this->lang('smtp_error') . $lasterror['error'];
				if (!empty($lasterror['detail'])) {
					$msg .= ' Detail: ' . $lasterror['detail'];
				}
				if (!empty($lasterror['smtp_code'])) {
					$msg .= ' SMTP code: ' . $lasterror['smtp_code'];
				}
				if (!empty($lasterror['smtp_code_ex'])) {
					$msg .= ' Additional SMTP info: ' . $lasterror['smtp_code_ex'];
				}
			}
		}
		$this->ErrorInfo = $msg;
	}

	/**
	 * Return an RFC 822 formatted date.
	 *
	 * @return string
	 */
	public static function rfcDate()
	{
		// Set the time zone to whatever the default is to avoid 500 errors
		// Will default to UTC if it's not set properly in php.ini
		date_default_timezone_set(@date_default_timezone_get());

		return date('D, j M Y H:i:s O');
	}

	/**
	 * Get the server hostname.
	 * Returns 'localhost.localdomain' if unknown.
	 *
	 * @return string
	 */
	protected function serverHostname()
	{
		$result = '';
		if (!empty($this->Hostname)) {
			$result = $this->Hostname;
		} elseif (isset($_SERVER) && array_key_exists('SERVER_NAME', $_SERVER)) {
			$result = $_SERVER['SERVER_NAME'];
		} elseif (function_exists('gethostname') && gethostname() !== false) {
			$result = gethostname();
		} elseif (php_uname('n') !== false) {
			$result = php_uname('n');
		}
		if (!static::isValidHost($result)) {
			return 'localhost.localdomain';
		}

		return $result;
	}

	/**
	 * Validate whether a string contains a valid value to use as a hostname or IP address.
	 * IPv6 addresses must include [], e.g. `[::1]`, not just `::1`.
	 *
	 * @param string $host The host name or IP address to check
	 *
	 * @return bool
	 */
	public static function isValidHost($host)
	{
		//Simple syntax limits
		if (empty($host)
			|| !is_string($host)
			|| strlen($host) > 256
		) {
			return false;
		}
		//Looks like a bracketed IPv6 address
		if (trim($host, '[]') !== $host) {
			return (bool) filter_var(trim($host, '[]'), FILTER_VALIDATE_IP, FILTER_FLAG_IPV6);
		}
		//If removing all the dots results in a numeric string, it must be an IPv4 address.
		//Need to check this first because otherwise things like `999.0.0.0` are considered valid host names
		if (is_numeric(str_replace('.', '', $host))) {
			//Is it a valid IPv4 address?
			return (bool) filter_var($host, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4);
		}
		if (filter_var('http://' . $host, FILTER_VALIDATE_URL)) {
			//Is it a syntactically valid hostname?
			return true;
		}

		return false;
	}

	/**
	 * Get an error message in the current language.
	 *
	 * @param string $key
	 *
	 * @return string
	 */
	protected function lang($key)
	{
		if (count($this->language) < 1) {
			$this->setLanguage(); // set the default language
		}

		if (array_key_exists($key, $this->language)) {
			if ('smtp_connect_failed' === $key) {
				//Include a link to troubleshooting docs on SMTP connection failure
				//this is by far the biggest cause of support questions
				//but it's usually not PHPMailer's fault.
				return $this->language[$key] . ' https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting';
			}

			return $this->language[$key];
		}

		//Return the key as a fallback
		return $key;
	}

	/**
	 * Check if an error occurred.
	 *
	 * @return bool True if an error did occur
	 */
	public function isError()
	{
		return $this->error_count > 0;
	}

	/**
	 * Add a custom header.
	 * $name value can be overloaded to contain
	 * both header name and value (name:value).
	 *
	 * @param string      $name  Custom header name
	 * @param string|null $value Header value
	 */
	public function addCustomHeader($name, $value = null)
	{
		if (null === $value) {
			// Value passed in as name:value
			$this->CustomHeader[] = explode(':', $name, 2);
		} else {
			$this->CustomHeader[] = [$name, $value];
		}
	}

	/**
	 * Returns all custom headers.
	 *
	 * @return array
	 */
	public function getCustomHeaders()
	{
		return $this->CustomHeader;
	}

	/**
	 * Create a message body from an HTML string.
	 * Automatically inlines images and creates a plain-text version by converting the HTML,
	 * overwriting any existing values in Body and AltBody.
	 * Do not source $message content from user input!
	 * $basedir is prepended when handling relative URLs, e.g. <img src="/images/a.png"> and must not be empty
	 * will look for an image file in $basedir/images/a.png and convert it to inline.
	 * If you don't provide a $basedir, relative paths will be left untouched (and thus probably break in email)
	 * Converts data-uri images into embedded attachments.
	 * If you don't want to apply these transformations to your HTML, just set Body and AltBody directly.
	 *
	 * @param string        $message  HTML message string
	 * @param string        $basedir  Absolute path to a base directory to prepend to relative paths to images
	 * @param bool|callable $advanced Whether to use the internal HTML to text converter
	 *                                or your own custom converter @return string $message The transformed message Body
	 *
	 * @throws Exception
	 *
	 * @see PHPMailer::html2text()
	 */
	public function msgHTML($message, $basedir = '', $advanced = false)
	{
		preg_match_all('/(src|background)=["\'](.*)["\']/Ui', $message, $images);
		if (array_key_exists(2, $images)) {
			if (strlen($basedir) > 1 && '/' !== substr($basedir, -1)) {
				// Ensure $basedir has a trailing /
				$basedir .= '/';
			}
			foreach ($images[2] as $imgindex => $url) {
				// Convert data URIs into embedded images
				//e.g. "data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw=="
				if (preg_match('#^data:(image/(?:jpe?g|gif|png));?(base64)?,(.+)#', $url, $match)) {
					if (count($match) === 4 && static::ENCODING_BASE64 === $match[2]) {
						$data = base64_decode($match[3]);
					} elseif ('' === $match[2]) {
						$data = rawurldecode($match[3]);
					} else {
						//Not recognised so leave it alone
						continue;
					}
					//Hash the decoded data, not the URL, so that the same data-URI image used in multiple places
					//will only be embedded once, even if it used a different encoding
					$cid = substr(hash('sha256', $data), 0, 32) . '@phpmailer.0'; // RFC2392 S 2

					if (!$this->cidExists($cid)) {
						$this->addStringEmbeddedImage(
							$data,
							$cid,
							'embed' . $imgindex,
							static::ENCODING_BASE64,
							$match[1]
						);
					}
					$message = str_replace(
						$images[0][$imgindex],
						$images[1][$imgindex] . '="cid:' . $cid . '"',
						$message
					);
					continue;
				}
				if (// Only process relative URLs if a basedir is provided (i.e. no absolute local paths)
					!empty($basedir)
					// Ignore URLs containing parent dir traversal (..)
					&& (strpos($url, '..') === false)
					// Do not change urls that are already inline images
					&& 0 !== strpos($url, 'cid:')
					// Do not change absolute URLs, including anonymous protocol
					&& !preg_match('#^[a-z][a-z0-9+.-]*:?//#i', $url)
				) {
					$filename = static::mb_pathinfo($url, PATHINFO_BASENAME);
					$directory = dirname($url);
					if ('.' === $directory) {
						$directory = '';
					}
					$cid = hash('sha256', $url) . '@phpmailer.0'; // RFC2392 S 2
					if (strlen($basedir) > 1 && '/' !== substr($basedir, -1)) {
						$basedir .= '/';
					}
					if (strlen($directory) > 1 && '/' !== substr($directory, -1)) {
						$directory .= '/';
					}
					if ($this->addEmbeddedImage(
						$basedir . $directory . $filename,
						$cid,
						$filename,
						static::ENCODING_BASE64,
						static::_mime_types((string) static::mb_pathinfo($filename, PATHINFO_EXTENSION))
					)
					) {
						$message = preg_replace(
							'/' . $images[1][$imgindex] . '=["\']' . preg_quote($url, '/') . '["\']/Ui',
							$images[1][$imgindex] . '="cid:' . $cid . '"',
							$message
						);
					}
				}
			}
		}
		$this->isHTML();
		// Convert all message body line breaks to LE, makes quoted-printable encoding work much better
		$this->Body = static::normalizeBreaks($message);
		$this->AltBody = static::normalizeBreaks($this->html2text($message, $advanced));
		if (!$this->alternativeExists()) {
			$this->AltBody = 'This is an HTML-only message. To view it, activate HTML in your email application.'
				. static::$LE;
		}

		return $this->Body;
	}

	/**
	 * Convert an HTML string into plain text.
	 * This is used by msgHTML().
	 * Note - older versions of this function used a bundled advanced converter
	 * which was removed for license reasons in #232.
	 * Example usage:
	 *
	 * ```php
	 * // Use default conversion
	 * $plain = $mail->html2text($html);
	 * // Use your own custom converter
	 * $plain = $mail->html2text($html, function($html) {
	 *     $converter = new MyHtml2text($html);
	 *     return $converter->get_text();
	 * });
	 * ```
	 *
	 * @param string        $html     The HTML text to convert
	 * @param bool|callable $advanced Any boolean value to use the internal converter,
	 *                                or provide your own callable for custom conversion
	 *
	 * @return string
	 */
	public function html2text($html, $advanced = false)
	{
		if (is_callable($advanced)) {
			return $advanced($html);
		}

		return html_entity_decode(
			trim(strip_tags(preg_replace('/<(head|title|style|script)[^>]*>.*?<\/\\1>/si', '', $html))),
			ENT_QUOTES,
			$this->CharSet
		);
	}

	/**
	 * Get the MIME type for a file extension.
	 *
	 * @param string $ext File extension
	 *
	 * @return string MIME type of file
	 */
	public static function _mime_types($ext = '')
	{
		$mimes = [
			'xl' => 'application/excel',
			'js' => 'application/javascript',
			'hqx' => 'application/mac-binhex40',
			'cpt' => 'application/mac-compactpro',
			'bin' => 'application/macbinary',
			'doc' => 'application/msword',
			'word' => 'application/msword',
			'xlsx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
			'xltx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.template',
			'potx' => 'application/vnd.openxmlformats-officedocument.presentationml.template',
			'ppsx' => 'application/vnd.openxmlformats-officedocument.presentationml.slideshow',
			'pptx' => 'application/vnd.openxmlformats-officedocument.presentationml.presentation',
			'sldx' => 'application/vnd.openxmlformats-officedocument.presentationml.slide',
			'docx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
			'dotx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.template',
			'xlam' => 'application/vnd.ms-excel.addin.macroEnabled.12',
			'xlsb' => 'application/vnd.ms-excel.sheet.binary.macroEnabled.12',
			'class' => 'application/octet-stream',
			'dll' => 'application/octet-stream',
			'dms' => 'application/octet-stream',
			'exe' => 'application/octet-stream',
			'lha' => 'application/octet-stream',
			'lzh' => 'application/octet-stream',
			'psd' => 'application/octet-stream',
			'sea' => 'application/octet-stream',
			'so' => 'application/octet-stream',
			'oda' => 'application/oda',
			'pdf' => 'application/pdf',
			'ai' => 'application/postscript',
			'eps' => 'application/postscript',
			'ps' => 'application/postscript',
			'smi' => 'application/smil',
			'smil' => 'application/smil',
			'mif' => 'application/vnd.mif',
			'xls' => 'application/vnd.ms-excel',
			'ppt' => 'application/vnd.ms-powerpoint',
			'wbxml' => 'application/vnd.wap.wbxml',
			'wmlc' => 'application/vnd.wap.wmlc',
			'dcr' => 'application/x-director',
			'dir' => 'application/x-director',
			'dxr' => 'application/x-director',
			'dvi' => 'application/x-dvi',
			'gtar' => 'application/x-gtar',
			'php3' => 'application/x-httpd-php',
			'php4' => 'application/x-httpd-php',
			'php' => 'application/x-httpd-php',
			'phtml' => 'application/x-httpd-php',
			'phps' => 'application/x-httpd-php-source',
			'swf' => 'application/x-shockwave-flash',
			'sit' => 'application/x-stuffit',
			'tar' => 'application/x-tar',
			'tgz' => 'application/x-tar',
			'xht' => 'application/xhtml+xml',
			'xhtml' => 'application/xhtml+xml',
			'zip' => 'application/zip',
			'mid' => 'audio/midi',
			'midi' => 'audio/midi',
			'mp2' => 'audio/mpeg',
			'mp3' => 'audio/mpeg',
			'm4a' => 'audio/mp4',
			'mpga' => 'audio/mpeg',
			'aif' => 'audio/x-aiff',
			'aifc' => 'audio/x-aiff',
			'aiff' => 'audio/x-aiff',
			'ram' => 'audio/x-pn-realaudio',
			'rm' => 'audio/x-pn-realaudio',
			'rpm' => 'audio/x-pn-realaudio-plugin',
			'ra' => 'audio/x-realaudio',
			'wav' => 'audio/x-wav',
			'mka' => 'audio/x-matroska',
			'bmp' => 'image/bmp',
			'gif' => 'image/gif',
			'jpeg' => 'image/jpeg',
			'jpe' => 'image/jpeg',
			'jpg' => 'image/jpeg',
			'png' => 'image/png',
			'tiff' => 'image/tiff',
			'tif' => 'image/tiff',
			'webp' => 'image/webp',
			'heif' => 'image/heif',
			'heifs' => 'image/heif-sequence',
			'heic' => 'image/heic',
			'heics' => 'image/heic-sequence',
			'eml' => 'message/rfc822',
			'css' => 'text/css',
			'html' => 'text/html',
			'htm' => 'text/html',
			'shtml' => 'text/html',
			'log' => 'text/plain',
			'text' => 'text/plain',
			'txt' => 'text/plain',
			'rtx' => 'text/richtext',
			'rtf' => 'text/rtf',
			'vcf' => 'text/vcard',
			'vcard' => 'text/vcard',
			'ics' => 'text/calendar',
			'xml' => 'text/xml',
			'xsl' => 'text/xml',
			'wmv' => 'video/x-ms-wmv',
			'mpeg' => 'video/mpeg',
			'mpe' => 'video/mpeg',
			'mpg' => 'video/mpeg',
			'mp4' => 'video/mp4',
			'm4v' => 'video/mp4',
			'mov' => 'video/quicktime',
			'qt' => 'video/quicktime',
			'rv' => 'video/vnd.rn-realvideo',
			'avi' => 'video/x-msvideo',
			'movie' => 'video/x-sgi-movie',
			'webm' => 'video/webm',
			'mkv' => 'video/x-matroska',
		];
		$ext = strtolower($ext);
		if (array_key_exists($ext, $mimes)) {
			return $mimes[$ext];
		}

		return 'application/octet-stream';
	}

	/**
	 * Map a file name to a MIME type.
	 * Defaults to 'application/octet-stream', i.e.. arbitrary binary data.
	 *
	 * @param string $filename A file name or full path, does not need to exist as a file
	 *
	 * @return string
	 */
	public static function filenameToType($filename)
	{
		// In case the path is a URL, strip any query string before getting extension
		$qpos = strpos($filename, '?');
		if (false !== $qpos) {
			$filename = substr($filename, 0, $qpos);
		}
		$ext = static::mb_pathinfo($filename, PATHINFO_EXTENSION);

		return static::_mime_types($ext);
	}

	/**
	 * Multi-byte-safe pathinfo replacement.
	 * Drop-in replacement for pathinfo(), but multibyte- and cross-platform-safe.
	 *
	 * @see http://www.php.net/manual/en/function.pathinfo.php#107461
	 *
	 * @param string     $path    A filename or path, does not need to exist as a file
	 * @param int|string $options Either a PATHINFO_* constant,
	 *                            or a string name to return only the specified piece
	 *
	 * @return string|array
	 */
	public static function mb_pathinfo($path, $options = null)
	{
		$ret = ['dirname' => '', 'basename' => '', 'extension' => '', 'filename' => ''];
		$pathinfo = [];
		if (preg_match('#^(.*?)[\\\\/]*(([^/\\\\]*?)(\.([^.\\\\/]+?)|))[\\\\/.]*$#m', $path, $pathinfo)) {
			if (array_key_exists(1, $pathinfo)) {
				$ret['dirname'] = $pathinfo[1];
			}
			if (array_key_exists(2, $pathinfo)) {
				$ret['basename'] = $pathinfo[2];
			}
			if (array_key_exists(5, $pathinfo)) {
				$ret['extension'] = $pathinfo[5];
			}
			if (array_key_exists(3, $pathinfo)) {
				$ret['filename'] = $pathinfo[3];
			}
		}
		switch ($options) {
			case PATHINFO_DIRNAME:
			case 'dirname':
				return $ret['dirname'];
			case PATHINFO_BASENAME:
			case 'basename':
				return $ret['basename'];
			case PATHINFO_EXTENSION:
			case 'extension':
				return $ret['extension'];
			case PATHINFO_FILENAME:
			case 'filename':
				return $ret['filename'];
			default:
				return $ret;
		}
	}

	/**
	 * Set or reset instance properties.
	 * You should avoid this function - it's more verbose, less efficient, more error-prone and
	 * harder to debug than setting properties directly.
	 * Usage Example:
	 * `$mail->set('SMTPSecure', static::ENCRYPTION_STARTTLS);`
	 *   is the same as:
	 * `$mail->SMTPSecure = static::ENCRYPTION_STARTTLS;`.
	 *
	 * @param string $name  The property name to set
	 * @param mixed  $value The value to set the property to
	 *
	 * @return bool
	 */
	public function set($name, $value = '')
	{
		if (property_exists($this, $name)) {
			$this->$name = $value;

			return true;
		}
		$this->setError($this->lang('variable_set') . $name);

		return false;
	}

	/**
	 * Strip newlines to prevent header injection.
	 *
	 * @param string $str
	 *
	 * @return string
	 */
	public function secureHeader($str)
	{
		return trim(str_replace(["\r", "\n"], '', $str));
	}

	/**
	 * Normalize line breaks in a string.
	 * Converts UNIX LF, Mac CR and Windows CRLF line breaks into a single line break format.
	 * Defaults to CRLF (for message bodies) and preserves consecutive breaks.
	 *
	 * @param string $text
	 * @param string $breaktype What kind of line break to use; defaults to static::$LE
	 *
	 * @return string
	 */
	public static function normalizeBreaks($text, $breaktype = null)
	{
		if (null === $breaktype) {
			$breaktype = static::$LE;
		}
		// Normalise to \n
		$text = str_replace(["\r\n", "\r"], "\n", $text);
		// Now convert LE as needed
		if ("\n" !== $breaktype) {
			$text = str_replace("\n", $breaktype, $text);
		}

		return $text;
	}

	/**
	 * Return the current line break format string.
	 *
	 * @return string
	 */
	public static function getLE()
	{
		return static::$LE;
	}

	/**
	 * Set the line break format string, e.g. "\r\n".
	 *
	 * @param string $le
	 */
	protected static function setLE($le)
	{
		static::$LE = $le;
	}

	/**
	 * Set the public and private key files and password for S/MIME signing.
	 *
	 * @param string $cert_filename
	 * @param string $key_filename
	 * @param string $key_pass            Password for private key
	 * @param string $extracerts_filename Optional path to chain certificate
	 */
	public function sign($cert_filename, $key_filename, $key_pass, $extracerts_filename = '')
	{
		$this->sign_cert_file = $cert_filename;
		$this->sign_key_file = $key_filename;
		$this->sign_key_pass = $key_pass;
		$this->sign_extracerts_file = $extracerts_filename;
	}

	/**
	 * Quoted-Printable-encode a DKIM header.
	 *
	 * @param string $txt
	 *
	 * @return string
	 */
	public function DKIM_QP($txt)
	{
		$line = '';
		$len = strlen($txt);
		for ($i = 0; $i < $len; ++$i) {
			$ord = ord($txt[$i]);
			if (((0x21 <= $ord) && ($ord <= 0x3A)) || $ord === 0x3C || ((0x3E <= $ord) && ($ord <= 0x7E))) {
				$line .= $txt[$i];
			} else {
				$line .= '=' . sprintf('%02X', $ord);
			}
		}

		return $line;
	}

	/**
	 * Generate a DKIM signature.
	 *
	 * @param string $signHeader
	 *
	 * @throws Exception
	 *
	 * @return string The DKIM signature value
	 */
	public function DKIM_Sign($signHeader)
	{
		if (!defined('PKCS7_TEXT')) {
			if ($this->exceptions) {
				throw new Exception($this->lang('extension_missing') . 'openssl');
			}

			return '';
		}
		$privKeyStr = !empty($this->DKIM_private_string) ?
			$this->DKIM_private_string :
			file_get_contents($this->DKIM_private);
		if ('' !== $this->DKIM_passphrase) {
			$privKey = openssl_pkey_get_private($privKeyStr, $this->DKIM_passphrase);
		} else {
			$privKey = openssl_pkey_get_private($privKeyStr);
		}
		if (openssl_sign($signHeader, $signature, $privKey, 'sha256WithRSAEncryption')) {
			openssl_pkey_free($privKey);

			return base64_encode($signature);
		}
		openssl_pkey_free($privKey);

		return '';
	}

	/**
	 * Generate a DKIM canonicalization header.
	 * Uses the 'relaxed' algorithm from RFC6376 section 3.4.2.
	 * Canonicalized headers should *always* use CRLF, regardless of mailer setting.
	 *
	 * @see https://tools.ietf.org/html/rfc6376#section-3.4.2
	 *
	 * @param string $signHeader Header
	 *
	 * @return string
	 */
	public function DKIM_HeaderC($signHeader)
	{
		//Note PCRE \s is too broad a definition of whitespace; RFC5322 defines it as `[ \t]`
		//@see https://tools.ietf.org/html/rfc5322#section-2.2
		//That means this may break if you do something daft like put vertical tabs in your headers.
		//Unfold header lines
		$signHeader = preg_replace('/\r\n[ \t]+/m', '', $signHeader);
		//Break headers out into an array
		$lines = explode("\r\n", $signHeader);
		foreach ($lines as $key => $line) {
			//If the header is missing a :, skip it as it's invalid
			//This is likely to happen because the explode() above will also split
			//on the trailing LE, leaving an empty line
			if (strpos($line, ':') === false) {
				continue;
			}
			list($heading, $value) = explode(':', $line, 2);
			//Lower-case header name
			$heading = strtolower($heading);
			//Collapse white space within the value, also convert WSP to space
			$value = preg_replace('/[ \t]+/', ' ', $value);
			//RFC6376 is slightly unclear here - it says to delete space at the *end* of each value
			//But then says to delete space before and after the colon.
			//Net result is the same as trimming both ends of the value.
			//By elimination, the same applies to the field name
			$lines[$key] = trim($heading, " \t") . ':' . trim($value, " \t");
		}

		return implode("\r\n", $lines);
	}

	/**
	 * Generate a DKIM canonicalization body.
	 * Uses the 'simple' algorithm from RFC6376 section 3.4.3.
	 * Canonicalized bodies should *always* use CRLF, regardless of mailer setting.
	 *
	 * @see https://tools.ietf.org/html/rfc6376#section-3.4.3
	 *
	 * @param string $body Message Body
	 *
	 * @return string
	 */
	public function DKIM_BodyC($body)
	{
		if (empty($body)) {
			return "\r\n";
		}
		// Normalize line endings to CRLF
		$body = static::normalizeBreaks($body, "\r\n");

		//Reduce multiple trailing line breaks to a single one
		return rtrim($body, "\r\n") . "\r\n";
	}

	/**
	 * Create the DKIM header and body in a new message header.
	 *
	 * @param string $headers_line Header lines
	 * @param string $subject      Subject
	 * @param string $body         Body
	 *
	 * @throws Exception
	 *
	 * @return string
	 */
	public function DKIM_Add($headers_line, $subject, $body)
	{
		$DKIMsignatureType = 'rsa-sha256'; // Signature & hash algorithms
		$DKIMcanonicalization = 'relaxed/simple'; // Canonicalization of header/body
		$DKIMquery = 'dns/txt'; // Query method
		$DKIMtime = time(); // Signature Timestamp = seconds since 00:00:00 - Jan 1, 1970 (UTC time zone)
		$subject_header = "Subject: $subject";
		$headers = explode(static::$LE, $headers_line);
		$from_header = '';
		$to_header = '';
		$date_header = '';
		$current = '';
		$copiedHeaderFields = '';
		$foundExtraHeaders = [];
		$extraHeaderKeys = '';
		$extraHeaderValues = '';
		$extraCopyHeaderFields = '';
		foreach ($headers as $header) {
			if (strpos($header, 'From:') === 0) {
				$from_header = $header;
				$current = 'from_header';
			} elseif (strpos($header, 'To:') === 0) {
				$to_header = $header;
				$current = 'to_header';
			} elseif (strpos($header, 'Date:') === 0) {
				$date_header = $header;
				$current = 'date_header';
			} elseif (!empty($this->DKIM_extraHeaders)) {
				foreach ($this->DKIM_extraHeaders as $extraHeader) {
					if (strpos($header, $extraHeader . ':') === 0) {
						$headerValue = $header;
						foreach ($this->CustomHeader as $customHeader) {
							if ($customHeader[0] === $extraHeader) {
								$headerValue = trim($customHeader[0]) .
									': ' .
									$this->encodeHeader(trim($customHeader[1]));
								break;
							}
						}
						$foundExtraHeaders[$extraHeader] = $headerValue;
						$current = '';
						break;
					}
				}
			} elseif (!empty($$current) && strpos($header, ' =?') === 0) {
				$$current .= $header;
			} else {
				$current = '';
			}
		}
		foreach ($foundExtraHeaders as $key => $value) {
			$extraHeaderKeys .= ':' . $key;
			$extraHeaderValues .= $value . "\r\n";
			if ($this->DKIM_copyHeaderFields) {
				$extraCopyHeaderFields .= ' |' . str_replace('|', '=7C', $this->DKIM_QP($value)) . ";\r\n";
			}
		}
		if ($this->DKIM_copyHeaderFields) {
			$from = str_replace('|', '=7C', $this->DKIM_QP($from_header));
			$to = str_replace('|', '=7C', $this->DKIM_QP($to_header));
			$date = str_replace('|', '=7C', $this->DKIM_QP($date_header));
			$subject = str_replace('|', '=7C', $this->DKIM_QP($subject_header));
			$copiedHeaderFields = " z=$from\r\n" .
				" |$to\r\n" .
				" |$date\r\n" .
				" |$subject;\r\n" .
				$extraCopyHeaderFields;
		}
		$body = $this->DKIM_BodyC($body);
		$DKIMlen = strlen($body); // Length of body
		$DKIMb64 = base64_encode(pack('H*', hash('sha256', $body))); // Base64 of packed binary SHA-256 hash of body
		if ('' === $this->DKIM_identity) {
			$ident = '';
		} else {
			$ident = ' i=' . $this->DKIM_identity . ';';
		}
		$dkimhdrs = 'DKIM-Signature: v=1; a=' .
			$DKIMsignatureType . '; q=' .
			$DKIMquery . '; l=' .
			$DKIMlen . '; s=' .
			$this->DKIM_selector .
			";\r\n" .
			' t=' . $DKIMtime . '; c=' . $DKIMcanonicalization . ";\r\n" .
			' h=From:To:Date:Subject' . $extraHeaderKeys . ";\r\n" .
			' d=' . $this->DKIM_domain . ';' . $ident . "\r\n" .
			$copiedHeaderFields .
			' bh=' . $DKIMb64 . ";\r\n" .
			' b=';
		$toSign = $this->DKIM_HeaderC(
			$from_header . "\r\n" .
			$to_header . "\r\n" .
			$date_header . "\r\n" .
			$subject_header . "\r\n" .
			$extraHeaderValues .
			$dkimhdrs
		);
		$signed = $this->DKIM_Sign($toSign);

		return static::normalizeBreaks($dkimhdrs . $signed) . static::$LE;
	}

	/**
	 * Detect if a string contains a line longer than the maximum line length
	 * allowed by RFC 2822 section 2.1.1.
	 *
	 * @param string $str
	 *
	 * @return bool
	 */
	public static function hasLineLongerThanMax($str)
	{
		return (bool) preg_match('/^(.{' . (self::MAX_LINE_LENGTH + strlen(static::$LE)) . ',})/m', $str);
	}

	/**
	 * Allows for public read access to 'to' property.
	 * Before the send() call, queued addresses (i.e. with IDN) are not yet included.
	 *
	 * @return array
	 */
	public function getToAddresses()
	{
		return $this->to;
	}

	/**
	 * Allows for public read access to 'cc' property.
	 * Before the send() call, queued addresses (i.e. with IDN) are not yet included.
	 *
	 * @return array
	 */
	public function getCcAddresses()
	{
		return $this->cc;
	}

	/**
	 * Allows for public read access to 'bcc' property.
	 * Before the send() call, queued addresses (i.e. with IDN) are not yet included.
	 *
	 * @return array
	 */
	public function getBccAddresses()
	{
		return $this->bcc;
	}

	/**
	 * Allows for public read access to 'ReplyTo' property.
	 * Before the send() call, queued addresses (i.e. with IDN) are not yet included.
	 *
	 * @return array
	 */
	public function getReplyToAddresses()
	{
		return $this->ReplyTo;
	}

	/**
	 * Allows for public read access to 'all_recipients' property.
	 * Before the send() call, queued addresses (i.e. with IDN) are not yet included.
	 *
	 * @return array
	 */
	public function getAllRecipientAddresses()
	{
		return $this->all_recipients;
	}

	/**
	 * Perform a callback.
	 *
	 * @param bool   $isSent
	 * @param array  $to
	 * @param array  $cc
	 * @param array  $bcc
	 * @param string $subject
	 * @param string $body
	 * @param string $from
	 * @param array  $extra
	 */
	protected function doCallback($isSent, $to, $cc, $bcc, $subject, $body, $from, $extra)
	{
		if (!empty($this->action_function) && is_callable($this->action_function)) {
			call_user_func($this->action_function, $isSent, $to, $cc, $bcc, $subject, $body, $from, $extra);
		}
	}

	/**
	 * Get the OAuth instance.
	 *
	 * @return OAuth
	 */
	public function getOAuth()
	{
		return $this->oauth;
	}

	/**
	 * Set an OAuth instance.
	 *
	 * @param OAuth $oauth
	 */
	public function setOAuth(OAuth $oauth)
	{
		$this->oauth = $oauth;
	}
}