Andrew Dolgov 1 year ago
commit
7f31179495

+ 28 - 0
README.txt

@@ -0,0 +1,28 @@
+Warning: this plugin uses PHPMailer which is a library with regularly discovered
+vulnerabilities. Use at your own risk.
+
+Installation:
+
+1. Git clone plugin to tt-rss/plugins.local/mailer_smtp
+2. Enable in config.php directive PLUGINS (this is a system plugin, it can't be enabled
+per-user).
+
+Add the following to config.php:
+
+	define('SMTP_SERVER', '');
+	// Hostname:port combination to send outgoing mail (i.e. localhost:25).
+	// Blank - use system MTA.
+
+	define('SMTP_LOGIN', '');
+	define('SMTP_PASSWORD', '');
+	// These two options enable SMTP authentication when sending
+	// outgoing mail. Only used with SMTP_SERVER.
+
+	define('SMTP_SECURE', '');
+	// Used to select a secure SMTP connection. Allowed values: ssl, tls,
+	// or empty.
+
+	define('SMTP_SKIP_CERT_CHECKS', false);
+	// Accept all SSL certificates, use with caution.
+
+At least SMTP_SERVER needs to set for plugin to work.

+ 85 - 0
init.php

@@ -0,0 +1,85 @@
+<?php
+class mailer_smtp extends Plugin {
+	private $host;
+
+	function about() {
+		return array(1.0,
+			"Supports sending mail via SMTP using PHPMailer. Read README.txt before enabling.",
+			"fox",
+			1);
+	}
+
+	function init($host) {
+		$this->host = $host;
+
+		$host->add_hook($host::HOOK_SEND_MAIL, $this);
+	}
+
+	function hook_send_mail($mailer, $params) {
+		if (defined('SMTP_SERVER') && SMTP_SERVER) {
+
+			$phpmailer = new PHPMailer\PHPMailer\PHPMailer();
+
+			$phpmailer->isSMTP();
+
+			$pair = explode(":", SMTP_SERVER, 2);
+			$phpmailer->Host = $pair[0];
+			$phpmailer->Port = $pair[1];
+
+			if (!$phpmailer->Port) $phpmailer->Port = 25;
+
+			if (defined('SMTP_LOGIN') && SMTP_LOGIN) {
+				$phpmailer->SMTPAuth = true;
+				$phpmailer->Username = SMTP_LOGIN;
+				$phpmailer->Password = SMTP_PASSWORD;
+			}
+
+			if (defined('SMTP_SECURE') && SMTP_SECURE) {
+				$phpmailer->SMTPSecure = SMTP_SECURE;
+			} else {
+				$phpmailer->SMTPAutoTLS = false;
+			}
+
+			if (defined('SMTP_SKIP_CERT_CHECKS') && SMTP_SKIP_CERT_CHECKS) {
+				$phpmailer->SMTPOptions = array(
+				    'ssl' => array(
+				        'verify_peer' => false,
+				        'verify_peer_name' => false,
+				        'allow_self_signed' => true
+				    )
+				);
+			}
+
+			$from_name = $params["from_name"] ? $params["from_name"] : SMTP_FROM_NAME;
+			$from_address = $params["from_address"] ? $params["from_address"] : SMTP_FROM_ADDRESS;
+
+			$phpmailer->setFrom($from_address, $from_name);
+			$phpmailer->addAddress($params["to_address"], $params["to_name"]);
+			$phpmailer->Subject = $params["subject"];
+
+			if ($params["message_html"]) {
+				$phpmailer->msgHTML($params["message_html"]);
+				$phpmailer->AltBody = $params["message"];
+			} else {
+				$phpmailer->Body = $params["message"];
+			}
+
+			foreach ($params['headers'] as $header) {
+				$phpmailer->addCustomHeader($header);
+			}
+
+			$rc = $phpmailer->send();
+
+			if (!$rc)
+				$mailer->set_error($rc . " " . $phpmailer->ErrorInfo);
+
+			return $rc;
+		}
+	}
+
+	function api_version() {
+		return 2;
+	}
+
+}
+?>

+ 502 - 0
vendor/PHPMailer/LICENSE

@@ -0,0 +1,502 @@
+                  GNU LESSER GENERAL PUBLIC LICENSE
+                       Version 2.1, February 1999
+
+ Copyright (C) 1991, 1999 Free Software Foundation, Inc.
+ 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+[This is the first released version of the Lesser GPL.  It also counts
+ as the successor of the GNU Library Public License, version 2, hence
+ the version number 2.1.]
+
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+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+
+Also add information on how to contact you by electronic and paper mail.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the library, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the
+  library `Frob' (a library for tweaking knobs) written by James Random Hacker.
+
+  <signature of Ty Coon>, 1 April 1990
+  Ty Coon, President of Vice
+
+That's all there is to it!

+ 39 - 0
vendor/PHPMailer/PHPMailer/Exception.php

@@ -0,0 +1,39 @@
+<?php
+/**
+ * PHPMailer Exception class.
+ * PHP Version 5.5.
+ *
+ * @see       https://github.com/PHPMailer/PHPMailer/ The PHPMailer GitHub project
+ *
+ * @author    Marcus Bointon (Synchro/coolbru) <[email protected]>
+ * @author    Jim Jagielski (jimjag) <[email protected]>
+ * @author    Andy Prevost (codeworxtech) <[email protected]>
+ * @author    Brent R. Matzelle (original founder)
+ * @copyright 2012 - 2017 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 exception handler.
+ *
+ * @author  Marcus Bointon <[email protected]>
+ */
+class Exception extends \Exception
+{
+    /**
+     * Prettify error message output.
+     *
+     * @return string
+     */
+    public function errorMessage()
+    {
+        return '<strong>' . htmlspecialchars($this->getMessage()) . "</strong><br />\n";
+    }
+}

+ 138 - 0
vendor/PHPMailer/PHPMailer/OAuth.php

@@ -0,0 +1,138 @@
+<?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) <[email protected]>
+ * @author    Jim Jagielski (jimjag) <[email protected]>
+ * @author    Andy Prevost (codeworxtech) <[email protected]>
+ * @author    Brent R. Matzelle (original founder)
+ * @copyright 2012 - 2015 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;
+
+use League\OAuth2\Client\Grant\RefreshToken;
+use League\OAuth2\Client\Provider\AbstractProvider;
+use League\OAuth2\Client\Token\AccessToken;
+
+/**
+ * OAuth - OAuth2 authentication wrapper class.
+ * Uses the oauth2-client package from the League of Extraordinary Packages.
+ *
+ * @see     http://oauth2-client.thephpleague.com
+ *
+ * @author  Marcus Bointon (Synchro/coolbru) <[email protected]>
+ */
+class OAuth
+{
+    /**
+     * An instance of the League OAuth Client Provider.
+     *
+     * @var AbstractProvider
+     */
+    protected $provider;
+
+    /**
+     * The current OAuth access token.
+     *
+     * @var AccessToken
+     */
+    protected $oauthToken;
+
+    /**
+     * The user's email address, usually used as the login ID
+     * and also the from address when sending email.
+     *
+     * @var string
+     */
+    protected $oauthUserEmail = '';
+
+    /**
+     * The client secret, generated in the app definition of the service you're connecting to.
+     *
+     * @var string
+     */
+    protected $oauthClientSecret = '';
+
+    /**
+     * The client ID, generated in the app definition of the service you're connecting to.
+     *
+     * @var string
+     */
+    protected $oauthClientId = '';
+
+    /**
+     * The refresh token, used to obtain new AccessTokens.
+     *
+     * @var string
+     */
+    protected $oauthRefreshToken = '';
+
+    /**
+     * OAuth constructor.
+     *
+     * @param array $options Associative array containing
+     *                       `provider`, `userName`, `clientSecret`, `clientId` and `refreshToken` elements
+     */
+    public function __construct($options)
+    {
+        $this->provider = $options['provider'];
+        $this->oauthUserEmail = $options['userName'];
+        $this->oauthClientSecret = $options['clientSecret'];
+        $this->oauthClientId = $options['clientId'];
+        $this->oauthRefreshToken = $options['refreshToken'];
+    }
+
+    /**
+     * Get a new RefreshToken.
+     *
+     * @return RefreshToken
+     */
+    protected function getGrant()
+    {
+        return new RefreshToken();
+    }
+
+    /**
+     * Get a new AccessToken.
+     *
+     * @return AccessToken
+     */
+    protected function getToken()
+    {
+        return $this->provider->getAccessToken(
+            $this->getGrant(),
+            ['refresh_token' => $this->oauthRefreshToken]
+        );
+    }
+
+    /**
+     * Generate a base64-encoded OAuth token.
+     *
+     * @return string
+     */
+    public function getOauth64()
+    {
+        // Get a new token if it's not available or has expired
+        if (null === $this->oauthToken or $this->oauthToken->hasExpired()) {
+            $this->oauthToken = $this->getToken();
+        }
+
+        return base64_encode(
+            'user=' .
+            $this->oauthUserEmail .
+            "\001auth=Bearer " .
+            $this->oauthToken .
+            "\001\001"
+        );
+    }
+}

+ 4502 - 0
vendor/PHPMailer/PHPMailer/PHPMailer.php

@@ -0,0 +1,4502 @@
+<?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) <[email protected]>
+ * @author    Jim Jagielski (jimjag) <[email protected]>
+ * @author    Andy Prevost (codeworxtech) <[email protected]>
+ * @author    Brent R. Matzelle (original founder)
+ * @copyright 2012 - 2017 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) <[email protected]>
+ * @author  Jim Jagielski (jimjag) <[email protected]>
+ * @author  Andy Prevost (codeworxtech) <[email protected]>
+ * @author  Brent R. Matzelle (original founder)
+ */
+class PHPMailer
+{
+    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';
+
+    /**
+     * 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 = '[email protected]';
+
+    /**
+     * 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 = '';
+
+    /**
+     * 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'.
+     *
+     * @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 "<[email protected]>",
+     * 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 of the message.
+     * 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: '', 'ssl' or 'tls'.
+     *
+     * @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 $Timeout = 300;
+
+    /**
+     * SMTP class debug output mode.
+     * Debug output level.
+     * Options:
+     * * `0` No output
+     * * `1` Commands
+     * * `2` Data and commands
+     * * `3` As 2 plus connection status
+     * * `4` Low-level data output.
+     *
+     * @see SMTP::$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 for none, or a string to use.
+     *
+     * @var string
+     */
+    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 = '6.0.6';
+
+    /**
+     * 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 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 or 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 (!in_array($this->Debugoutput, ['error_log', 'html', 'echo']) and is_callable($this->Debugoutput)) {
+            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/ms', "\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 $name
+     *
+     * @return bool true on success, false if address already used or invalid in some way
+     */
+    public function addAddress($address, $name = '')
+    {
+        return $this->addOrEnqueueAnAddress('to', $address, $name);
+    }
+
+    /**
+     * Add a "CC" address.
+     *
+     * @param string $address The email address to send to
+     * @param string $name
+     *
+     * @return bool true on success, false if address already used or invalid in some way
+     */
+    public function addCC($address, $name = '')
+    {
+        return $this->addOrEnqueueAnAddress('cc', $address, $name);
+    }
+
+    /**
+     * Add a "BCC" address.
+     *
+     * @param string $address The email address to send to
+     * @param string $name
+     *
+     * @return bool true on success, false if address already used or invalid in some way
+     */
+    public function addBCC($address, $name = '')
+    {
+        return $this->addOrEnqueueAnAddress('bcc', $address, $name);
+    }
+
+    /**
+     * Add a "Reply-To" address.
+     *
+     * @param string $address The email address to reply to
+     * @param string $name
+     *
+     * @return bool true on success, false if address already used or invalid in some way
+     */
+    public function addReplyTo($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 ($this->has8bitChars(substr($address, ++$pos)) and static::idnSupported()) {
+            if ('Reply-To' != $kind) {
+                if (!array_key_exists($address, $this->RecipientsQueue)) {
+                    $this->RecipientsQueue[$address] = $params;
+
+                    return true;
+                }
+            } else {
+                if (!array_key_exists($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;
+            }
+        } else {
+            if (!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 and 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.' != $address->host) {
+                    if (static::validateAddress($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 === $pos or
+            (!$this->has8bitChars(substr($address, ++$pos)) or !static::idnSupported()) and
+            !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) {
+            if (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 $this->lastMessageID;
+    }
+
+    /**
+     * Check that a string looks like an email address.
+     * Validation patterns supported:
+     * * `auto` Pick best pattern automatically;
+     * * `pcre8` Use the squiloople.com pattern, requires PCRE > 8.0;
+     * * `pcre` Use old PCRE implementation;
+     * * `php` Use PHP built-in FILTER_VALIDATE_EMAIL;
+     * * `html5` Use the pattern given by the HTML5 spec for 'email' type form input elements.
+     * * `noregex` Don't use a regex: super fast, really dumb.
+     * Alternatively you may pass in a callable to inject your own validator, for example:
+     *
+     * ```php
+     * PHPMailer::validateAddress('[email protected]', function($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($patternselect)) {
+            return call_user_func($patternselect, $address);
+        }
+        //Reject line breaks in addresses; it's valid RFC5322, but not RFC5321
+        if (strpos($address, "\n") !== false or 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: `[email protected]`
+                 *  * comments: `1234 @ local(blah) .machine .example`
+                 *  * quoted elements: `'"test blah"@example.org'`
+                 *  * numeric TLDs: `[email protected]`
+                 *  * unbracketed IPv4 literals: `[email protected]`
+                 *  * IPv6 literals: '[email protected][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',
+                    $address
+                );
+            case 'html5':
+                /*
+                 * This is the pattern used in the HTML5 spec for validation of 'email' type form input elements.
+                 *
+                 * @see http://www.whatwg.org/specs/web-apps/current-work/#e-mail-state-(type=email)
+                 */
+                return (bool) preg_match(
+                    '/^[a-zA-Z0-9.!#$%&\'*+\/=?^_`{|}~-][email protected][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') and 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 (static::idnSupported() and
+            !empty($this->CharSet) and
+            false !== $pos
+        ) {
+            $domain = substr($address, ++$pos);
+            // Verify CharSet string is a valid one, and domain properly encoded in this CharSet.
+            if ($this->has8bitChars($domain) and @mb_check_encoding($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 or
+            ('mail' == $this->Mailer and 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 (ini_get('mail.add_x_header') == 1
+            and 'mail' == $this->Mailer
+            and stripos(PHP_OS, 'WIN') === 0
+            and ((version_compare(PHP_VERSION, '7.0.0', '>=')
+                    and version_compare(PHP_VERSION, '7.0.17', '<'))
+                or (version_compare(PHP_VERSION, '7.1.0', '>=')
+                    and version_compare(PHP_VERSION, '7.1.3', '<')))
+        ) {
+            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 and 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)
+                and !empty($this->DKIM_selector)
+                and (!empty($this->DKIM_private_string)
+                    or (!empty($this->DKIM_private)
+                        and static::isPermittedPath($this->DKIM_private)
+                        and 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) and self::isShellSafe($this->Sender)) {
+            if ('qmail' == $this->Mailer) {
+                $sendmailFmt = '%s -f%s';
+            } else {
+                $sendmailFmt = '%s -oi -f%s -t';
+            }
+        } else {
+            if ('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) !== $string
+            or !in_array(escapeshellarg($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);
+
+        $params = null;
+        //This sets the SMTP envelope sender which gets turned into a return-path header by the receiver
+        if (!empty($this->Sender) and static::validateAddress($this->Sender)) {
+            //A space after `-f` is optional, but there is a long history of its presence
+            //causing problems, so we don't use one
+            //Exim docs: http://www.exim.org/exim-html-current/doc/html/spec_html/ch-the_exim_command_line.html
+            //Sendmail docs: http://www.sendmail.org/~ca/email/man/sendmail.html
+            //Qmail docs: http://www.qmail.org/man/man8/qmail-inject.html
+            //Example problem: https://www.drupal.org/node/1057954
+            // CVE-2016-10033, CVE-2016-10045: Don't pass -f if characters will be escaped.
+            if (self::isShellSafe($this->Sender)) {
+                $params = sprintf('-f%s', $this->Sender);
+            }
+        }
+        if (!empty($this->Sender) and static::validateAddress($this->Sender)) {
+            $old_from = ini_get('sendmail_from');
+            ini_set('sendmail_from', $this->Sender);
+        }
+        $result = false;
+        if ($this->SingleTo and 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])) {
+                    $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($bad_rcpt)) and !$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-Z0-9\.-]*|\[[a-fA-F0-9:]+\]):?([0-9]*)$/',
+                trim($hostentry),
+                $hostinfo
+            )) {
+                static::edebug($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])) {
+                static::edebug($this->lang('connect_host') . ' ' . $hostentry);
+                continue;
+            }
+            $prefix = '';
+            $secure = $this->SMTPSecure;
+            $tls = ('tls' == $this->SMTPSecure);
+            if ('ssl' == $hostinfo[2] or ('' == $hostinfo[2] and 'ssl' == $this->SMTPSecure)) {
+                $prefix = 'ssl://';
+                $tls = false; // Can't have SSL and TLS at the same time
+                $secure = 'ssl';
+            } elseif ('tls' == $hostinfo[2]) {
+                $tls = true;
+                // tls doesn't use a prefix
+                $secure = 'tls';
+            }
+            //Do we need the OpenSSL extension?
+            $sslext = defined('OPENSSL_ALGO_SHA256');
+            if ('tls' === $secure or 'ssl' === $secure) {
+                //Check for an OpenSSL constant rather than using extension_loaded, which is sometimes disabled
+                if (!$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 and $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 and $sslext and 'ssl' != $secure and $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 ($this->SMTPAuth) {
+                        if (!$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 and null !== $lastexception) {
+            throw $lastexception;
+        }
+
+        return false;
+    }
+
+    /**
+     * Close the active SMTP session if one exists.
+     */
+    public function smtpClose()
+    {
+        if (null !== $this->smtp) {
+            if ($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  $addr An array of recipients,
+     *                     where each recipient is a 2-element indexed array with element 0 containing an address
+     *                     and element 1 containing a name, like:
+     *                     [['[email protected]', 'Joe User'], ['[email protected]', 'Zoe User']]
+     *
+     * @return string
+     */
+    public function addrAppend($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 $addr A 2-element indexed array, element 0 containing an address, element 1 containing a name like
+     *                    ['[email protected]', 'Joe User']
+     *
+     * @return string
+     */
+    public function addrFormat($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]
+            ) . '>';