diff --git a/src/lib/PHPMailer/SMTP.php b/src/lib/PHPMailer/SMTP.php
new file mode 100644
index 0000000..2b63840
--- /dev/null
+++ b/src/lib/PHPMailer/SMTP.php
@@ -0,0 +1,1466 @@
+<?php
+
+/**
+ * PHPMailer RFC821 SMTP email 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 - 2020 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 RFC821 SMTP email transport class.
+ * Implements RFC 821 SMTP commands and provides some utility methods for sending mail to an SMTP server.
+ *
+ * @author Chris Ryan
+ * @author Marcus Bointon <phpmailer@synchromedia.co.uk>
+ */
+class SMTP
+{
+    /**
+     * The PHPMailer SMTP version number.
+     *
+     * @var string
+     */
+    const VERSION = '6.8.1';
+
+    /**
+     * SMTP line break constant.
+     *
+     * @var string
+     */
+    const LE = "\r\n";
+
+    /**
+     * The SMTP port to use if one is not specified.
+     *
+     * @var int
+     */
+    const DEFAULT_PORT = 25;
+
+    /**
+     * The SMTPs port to use if one is not specified.
+     *
+     * @var int
+     */
+    const DEFAULT_SECURE_PORT = 465;
+
+    /**
+     * The maximum line length allowed by RFC 5321 section 4.5.3.1.6,
+     * *excluding* a trailing CRLF break.
+     *
+     * @see https://tools.ietf.org/html/rfc5321#section-4.5.3.1.6
+     *
+     * @var int
+     */
+    const MAX_LINE_LENGTH = 998;
+
+    /**
+     * The maximum line length allowed for replies in RFC 5321 section 4.5.3.1.5,
+     * *including* a trailing CRLF line break.
+     *
+     * @see https://tools.ietf.org/html/rfc5321#section-4.5.3.1.5
+     *
+     * @var int
+     */
+    const MAX_REPLY_LENGTH = 512;
+
+    /**
+     * Debug level for no output.
+     *
+     * @var int
+     */
+    const DEBUG_OFF = 0;
+
+    /**
+     * Debug level to show client -> server messages.
+     *
+     * @var int
+     */
+    const DEBUG_CLIENT = 1;
+
+    /**
+     * Debug level to show client -> server and server -> client messages.
+     *
+     * @var int
+     */
+    const DEBUG_SERVER = 2;
+
+    /**
+     * Debug level to show connection status, client -> server and server -> client messages.
+     *
+     * @var int
+     */
+    const DEBUG_CONNECTION = 3;
+
+    /**
+     * Debug level to show all messages.
+     *
+     * @var int
+     */
+    const DEBUG_LOWLEVEL = 4;
+
+    /**
+     * Debug output level.
+     * Options:
+     * * self::DEBUG_OFF (`0`) No debug output, default
+     * * self::DEBUG_CLIENT (`1`) Client commands
+     * * self::DEBUG_SERVER (`2`) Client commands and server responses
+     * * self::DEBUG_CONNECTION (`3`) As DEBUG_SERVER plus connection status
+     * * self::DEBUG_LOWLEVEL (`4`) Low-level data output, all messages.
+     *
+     * @var int
+     */
+    public $do_debug = self::DEBUG_OFF;
+
+    /**
+     * 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
+     * Alternatively, you can provide a callable expecting two params: a message string and the debug level:
+     *
+     * ```php
+     * $smtp->Debugoutput = function($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;
+     * ```
+     *
+     * @var string|callable|\Psr\Log\LoggerInterface
+     */
+    public $Debugoutput = 'echo';
+
+    /**
+     * Whether to use VERP.
+     *
+     * @see http://en.wikipedia.org/wiki/Variable_envelope_return_path
+     * @see http://www.postfix.org/VERP_README.html Info on VERP
+     *
+     * @var bool
+     */
+    public $do_verp = false;
+
+    /**
+     * The timeout value for connection, in seconds.
+     * Default of 5 minutes (300sec) is from RFC2821 section 4.5.3.2.
+     * This needs to be quite high to function correctly with hosts using greetdelay as an anti-spam measure.
+     *
+     * @see http://tools.ietf.org/html/rfc2821#section-4.5.3.2
+     *
+     * @var int
+     */
+    public $Timeout = 300;
+
+    /**
+     * How long to wait for commands to complete, in seconds.
+     * Default of 5 minutes (300sec) is from RFC2821 section 4.5.3.2.
+     *
+     * @var int
+     */
+    public $Timelimit = 300;
+
+    /**
+     * Patterns to extract an SMTP transaction id from reply to a DATA command.
+     * The first capture group in each regex will be used as the ID.
+     * MS ESMTP returns the message ID, which may not be correct for internal tracking.
+     *
+     * @var string[]
+     */
+    protected $smtp_transaction_id_patterns = [
+        'exim' => '/[\d]{3} OK id=(.*)/',
+        'sendmail' => '/[\d]{3} 2.0.0 (.*) Message/',
+        'postfix' => '/[\d]{3} 2.0.0 Ok: queued as (.*)/',
+        'Microsoft_ESMTP' => '/[0-9]{3} 2.[\d].0 (.*)@(?:.*) Queued mail for delivery/',
+        'Amazon_SES' => '/[\d]{3} Ok (.*)/',
+        'SendGrid' => '/[\d]{3} Ok: queued as (.*)/',
+        'CampaignMonitor' => '/[\d]{3} 2.0.0 OK:([a-zA-Z\d]{48})/',
+        'Haraka' => '/[\d]{3} Message Queued \((.*)\)/',
+        'ZoneMTA' => '/[\d]{3} Message queued as (.*)/',
+        'Mailjet' => '/[\d]{3} OK queued as (.*)/',
+    ];
+
+    /**
+     * The last transaction ID issued in response to a DATA command,
+     * if one was detected.
+     *
+     * @var string|bool|null
+     */
+    protected $last_smtp_transaction_id;
+
+    /**
+     * The socket for the server connection.
+     *
+     * @var ?resource
+     */
+    protected $smtp_conn;
+
+    /**
+     * Error information, if any, for the last SMTP command.
+     *
+     * @var array
+     */
+    protected $error = [
+        'error' => '',
+        'detail' => '',
+        'smtp_code' => '',
+        'smtp_code_ex' => '',
+    ];
+
+    /**
+     * The reply the server sent to us for HELO.
+     * If null, no HELO string has yet been received.
+     *
+     * @var string|null
+     */
+    protected $helo_rply;
+
+    /**
+     * The set of SMTP extensions sent in reply to EHLO command.
+     * Indexes of the array are extension names.
+     * Value at index 'HELO' or 'EHLO' (according to command that was sent)
+     * represents the server name. In case of HELO it is the only element of the array.
+     * Other values can be boolean TRUE or an array containing extension options.
+     * If null, no HELO/EHLO string has yet been received.
+     *
+     * @var array|null
+     */
+    protected $server_caps;
+
+    /**
+     * The most recent reply received from the server.
+     *
+     * @var string
+     */
+    protected $last_reply = '';
+
+    /**
+     * Output debugging info via a user-selected method.
+     *
+     * @param string $str   Debug string to output
+     * @param int    $level The debug level of this message; see DEBUG_* constants
+     *
+     * @see SMTP::$Debugoutput
+     * @see SMTP::$do_debug
+     */
+    protected function edebug($str, $level = 0)
+    {
+        if ($level > $this->do_debug) {
+            return;
+        }
+        //Is this a PSR-3 logger?
+        if ($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, $level);
+
+            return;
+        }
+        switch ($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 gmdate('Y-m-d H:i:s'), ' ', 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";
+        }
+    }
+
+    /**
+     * Connect to an SMTP server.
+     *
+     * @param string $host    SMTP server IP or host name
+     * @param int    $port    The port number to connect to
+     * @param int    $timeout How long to wait for the connection to open
+     * @param array  $options An array of options for stream_context_create()
+     *
+     * @return bool
+     */
+    public function connect($host, $port = null, $timeout = 30, $options = [])
+    {
+        //Clear errors to avoid confusion
+        $this->setError('');
+        //Make sure we are __not__ connected
+        if ($this->connected()) {
+            //Already connected, generate error
+            $this->setError('Already connected to a server');
+
+            return false;
+        }
+        if (empty($port)) {
+            $port = self::DEFAULT_PORT;
+        }
+        //Connect to the SMTP server
+        $this->edebug(
+            "Connection: opening to $host:$port, timeout=$timeout, options=" .
+            (count($options) > 0 ? var_export($options, true) : 'array()'),
+            self::DEBUG_CONNECTION
+        );
+
+        $this->smtp_conn = $this->getSMTPConnection($host, $port, $timeout, $options);
+
+        if ($this->smtp_conn === false) {
+            //Error info already set inside `getSMTPConnection()`
+            return false;
+        }
+
+        $this->edebug('Connection: opened', self::DEBUG_CONNECTION);
+
+        //Get any announcement
+        $this->last_reply = $this->get_lines();
+        $this->edebug('SERVER -> CLIENT: ' . $this->last_reply, self::DEBUG_SERVER);
+        $responseCode = (int)substr($this->last_reply, 0, 3);
+        if ($responseCode === 220) {
+            return true;
+        }
+        //Anything other than a 220 response means something went wrong
+        //RFC 5321 says the server will wait for us to send a QUIT in response to a 554 error
+        //https://tools.ietf.org/html/rfc5321#section-3.1
+        if ($responseCode === 554) {
+            $this->quit();
+        }
+        //This will handle 421 responses which may not wait for a QUIT (e.g. if the server is being shut down)
+        $this->edebug('Connection: closing due to error', self::DEBUG_CONNECTION);
+        $this->close();
+        return false;
+    }
+
+    /**
+     * Create connection to the SMTP server.
+     *
+     * @param string $host    SMTP server IP or host name
+     * @param int    $port    The port number to connect to
+     * @param int    $timeout How long to wait for the connection to open
+     * @param array  $options An array of options for stream_context_create()
+     *
+     * @return false|resource
+     */
+    protected function getSMTPConnection($host, $port = null, $timeout = 30, $options = [])
+    {
+        static $streamok;
+        //This is enabled by default since 5.0.0 but some providers disable it
+        //Check this once and cache the result
+        if (null === $streamok) {
+            $streamok = function_exists('stream_socket_client');
+        }
+
+        $errno = 0;
+        $errstr = '';
+        if ($streamok) {
+            $socket_context = stream_context_create($options);
+            set_error_handler([$this, 'errorHandler']);
+            $connection = stream_socket_client(
+                $host . ':' . $port,
+                $errno,
+                $errstr,
+                $timeout,
+                STREAM_CLIENT_CONNECT,
+                $socket_context
+            );
+        } else {
+            //Fall back to fsockopen which should work in more places, but is missing some features
+            $this->edebug(
+                'Connection: stream_socket_client not available, falling back to fsockopen',
+                self::DEBUG_CONNECTION
+            );
+            set_error_handler([$this, 'errorHandler']);
+            $connection = fsockopen(
+                $host,
+                $port,
+                $errno,
+                $errstr,
+                $timeout
+            );
+        }
+        restore_error_handler();
+
+        //Verify we connected properly
+        if (!is_resource($connection)) {
+            $this->setError(
+                'Failed to connect to server',
+                '',
+                (string) $errno,
+                $errstr
+            );
+            $this->edebug(
+                'SMTP ERROR: ' . $this->error['error']
+                . ": $errstr ($errno)",
+                self::DEBUG_CLIENT
+            );
+
+            return false;
+        }
+
+        //SMTP server can take longer to respond, give longer timeout for first read
+        //Windows does not have support for this timeout function
+        if (strpos(PHP_OS, 'WIN') !== 0) {
+            $max = (int)ini_get('max_execution_time');
+            //Don't bother if unlimited, or if set_time_limit is disabled
+            if (0 !== $max && $timeout > $max && strpos(ini_get('disable_functions'), 'set_time_limit') === false) {
+                @set_time_limit($timeout);
+            }
+            stream_set_timeout($connection, $timeout, 0);
+        }
+
+        return $connection;
+    }
+
+    /**
+     * Initiate a TLS (encrypted) session.
+     *
+     * @return bool
+     */
+    public function startTLS()
+    {
+        if (!$this->sendCommand('STARTTLS', 'STARTTLS', 220)) {
+            return false;
+        }
+
+        //Allow the best TLS version(s) we can
+        $crypto_method = STREAM_CRYPTO_METHOD_TLS_CLIENT;
+
+        //PHP 5.6.7 dropped inclusion of TLS 1.1 and 1.2 in STREAM_CRYPTO_METHOD_TLS_CLIENT
+        //so add them back in manually if we can
+        if (defined('STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT')) {
+            $crypto_method |= STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT;
+            $crypto_method |= STREAM_CRYPTO_METHOD_TLSv1_1_CLIENT;
+        }
+
+        //Begin encrypted connection
+        set_error_handler([$this, 'errorHandler']);
+        $crypto_ok = stream_socket_enable_crypto(
+            $this->smtp_conn,
+            true,
+            $crypto_method
+        );
+        restore_error_handler();
+
+        return (bool) $crypto_ok;
+    }
+
+    /**
+     * Perform SMTP authentication.
+     * Must be run after hello().
+     *
+     * @see    hello()
+     *
+     * @param string $username The user name
+     * @param string $password The password
+     * @param string $authtype The auth type (CRAM-MD5, PLAIN, LOGIN, XOAUTH2)
+     * @param OAuthTokenProvider $OAuth An optional OAuthTokenProvider instance for XOAUTH2 authentication
+     *
+     * @return bool True if successfully authenticated
+     */
+    public function authenticate(
+        $username,
+        $password,
+        $authtype = null,
+        $OAuth = null
+    ) {
+        if (!$this->server_caps) {
+            $this->setError('Authentication is not allowed before HELO/EHLO');
+
+            return false;
+        }
+
+        if (array_key_exists('EHLO', $this->server_caps)) {
+            //SMTP extensions are available; try to find a proper authentication method
+            if (!array_key_exists('AUTH', $this->server_caps)) {
+                $this->setError('Authentication is not allowed at this stage');
+                //'at this stage' means that auth may be allowed after the stage changes
+                //e.g. after STARTTLS
+
+                return false;
+            }
+
+            $this->edebug('Auth method requested: ' . ($authtype ?: 'UNSPECIFIED'), self::DEBUG_LOWLEVEL);
+            $this->edebug(
+                'Auth methods available on the server: ' . implode(',', $this->server_caps['AUTH']),
+                self::DEBUG_LOWLEVEL
+            );
+
+            //If we have requested a specific auth type, check the server supports it before trying others
+            if (null !== $authtype && !in_array($authtype, $this->server_caps['AUTH'], true)) {
+                $this->edebug('Requested auth method not available: ' . $authtype, self::DEBUG_LOWLEVEL);
+                $authtype = null;
+            }
+
+            if (empty($authtype)) {
+                //If no auth mechanism is specified, attempt to use these, in this order
+                //Try CRAM-MD5 first as it's more secure than the others
+                foreach (['CRAM-MD5', 'LOGIN', 'PLAIN', 'XOAUTH2'] as $method) {
+                    if (in_array($method, $this->server_caps['AUTH'], true)) {
+                        $authtype = $method;
+                        break;
+                    }
+                }
+                if (empty($authtype)) {
+                    $this->setError('No supported authentication methods found');
+
+                    return false;
+                }
+                $this->edebug('Auth method selected: ' . $authtype, self::DEBUG_LOWLEVEL);
+            }
+
+            if (!in_array($authtype, $this->server_caps['AUTH'], true)) {
+                $this->setError("The requested authentication method \"$authtype\" is not supported by the server");
+
+                return false;
+            }
+        } elseif (empty($authtype)) {
+            $authtype = 'LOGIN';
+        }
+        switch ($authtype) {
+            case 'PLAIN':
+                //Start authentication
+                if (!$this->sendCommand('AUTH', 'AUTH PLAIN', 334)) {
+                    return false;
+                }
+                //Send encoded username and password
+                if (
+                    //Format from https://tools.ietf.org/html/rfc4616#section-2
+                    //We skip the first field (it's forgery), so the string starts with a null byte
+                    !$this->sendCommand(
+                        'User & Password',
+                        base64_encode("\0" . $username . "\0" . $password),
+                        235
+                    )
+                ) {
+                    return false;
+                }
+                break;
+            case 'LOGIN':
+                //Start authentication
+                if (!$this->sendCommand('AUTH', 'AUTH LOGIN', 334)) {
+                    return false;
+                }
+                if (!$this->sendCommand('Username', base64_encode($username), 334)) {
+                    return false;
+                }
+                if (!$this->sendCommand('Password', base64_encode($password), 235)) {
+                    return false;
+                }
+                break;
+            case 'CRAM-MD5':
+                //Start authentication
+                if (!$this->sendCommand('AUTH CRAM-MD5', 'AUTH CRAM-MD5', 334)) {
+                    return false;
+                }
+                //Get the challenge
+                $challenge = base64_decode(substr($this->last_reply, 4));
+
+                //Build the response
+                $response = $username . ' ' . $this->hmac($challenge, $password);
+
+                //send encoded credentials
+                return $this->sendCommand('Username', base64_encode($response), 235);
+            case 'XOAUTH2':
+                //The OAuth instance must be set up prior to requesting auth.
+                if (null === $OAuth) {
+                    return false;
+                }
+                $oauth = $OAuth->getOauth64();
+
+                //Start authentication
+                if (!$this->sendCommand('AUTH', 'AUTH XOAUTH2 ' . $oauth, 235)) {
+                    return false;
+                }
+                break;
+            default:
+                $this->setError("Authentication method \"$authtype\" is not supported");
+
+                return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * Calculate an MD5 HMAC hash.
+     * Works like hash_hmac('md5', $data, $key)
+     * in case that function is not available.
+     *
+     * @param string $data The data to hash
+     * @param string $key  The key to hash with
+     *
+     * @return string
+     */
+    protected function hmac($data, $key)
+    {
+        if (function_exists('hash_hmac')) {
+            return hash_hmac('md5', $data, $key);
+        }
+
+        //The following borrowed from
+        //http://php.net/manual/en/function.mhash.php#27225
+
+        //RFC 2104 HMAC implementation for php.
+        //Creates an md5 HMAC.
+        //Eliminates the need to install mhash to compute a HMAC
+        //by Lance Rushing
+
+        $bytelen = 64; //byte length for md5
+        if (strlen($key) > $bytelen) {
+            $key = pack('H*', md5($key));
+        }
+        $key = str_pad($key, $bytelen, chr(0x00));
+        $ipad = str_pad('', $bytelen, chr(0x36));
+        $opad = str_pad('', $bytelen, chr(0x5c));
+        $k_ipad = $key ^ $ipad;
+        $k_opad = $key ^ $opad;
+
+        return md5($k_opad . pack('H*', md5($k_ipad . $data)));
+    }
+
+    /**
+     * Check connection state.
+     *
+     * @return bool True if connected
+     */
+    public function connected()
+    {
+        if (is_resource($this->smtp_conn)) {
+            $sock_status = stream_get_meta_data($this->smtp_conn);
+            if ($sock_status['eof']) {
+                //The socket is valid but we are not connected
+                $this->edebug(
+                    'SMTP NOTICE: EOF caught while checking if connected',
+                    self::DEBUG_CLIENT
+                );
+                $this->close();
+
+                return false;
+            }
+
+            return true; //everything looks good
+        }
+
+        return false;
+    }
+
+    /**
+     * Close the socket and clean up the state of the class.
+     * Don't use this function without first trying to use QUIT.
+     *
+     * @see quit()
+     */
+    public function close()
+    {
+        $this->server_caps = null;
+        $this->helo_rply = null;
+        if (is_resource($this->smtp_conn)) {
+            //Close the connection and cleanup
+            fclose($this->smtp_conn);
+            $this->smtp_conn = null; //Makes for cleaner serialization
+            $this->edebug('Connection: closed', self::DEBUG_CONNECTION);
+        }
+    }
+
+    /**
+     * Send an SMTP DATA command.
+     * Issues a data command and sends the msg_data to the server,
+     * finalizing the mail transaction. $msg_data is the message
+     * that is to be sent with the headers. Each header needs to be
+     * on a single line followed by a <CRLF> with the message headers
+     * and the message body being separated by an additional <CRLF>.
+     * Implements RFC 821: DATA <CRLF>.
+     *
+     * @param string $msg_data Message data to send
+     *
+     * @return bool
+     */
+    public function data($msg_data)
+    {
+        //This will use the standard timelimit
+        if (!$this->sendCommand('DATA', 'DATA', 354)) {
+            return false;
+        }
+
+        /* The server is ready to accept data!
+         * According to rfc821 we should not send more than 1000 characters on a single line (including the LE)
+         * so we will break the data up into lines by \r and/or \n then if needed we will break each of those into
+         * smaller lines to fit within the limit.
+         * We will also look for lines that start with a '.' and prepend an additional '.'.
+         * NOTE: this does not count towards line-length limit.
+         */
+
+        //Normalize line breaks before exploding
+        $lines = explode("\n", str_replace(["\r\n", "\r"], "\n", $msg_data));
+
+        /* To distinguish between a complete RFC822 message and a plain message body, we check if the first field
+         * of the first line (':' separated) does not contain a space then it _should_ be a header, and we will
+         * process all lines before a blank line as headers.
+         */
+
+        $field = substr($lines[0], 0, strpos($lines[0], ':'));
+        $in_headers = false;
+        if (!empty($field) && strpos($field, ' ') === false) {
+            $in_headers = true;
+        }
+
+        foreach ($lines as $line) {
+            $lines_out = [];
+            if ($in_headers && $line === '') {
+                $in_headers = false;
+            }
+            //Break this line up into several smaller lines if it's too long
+            //Micro-optimisation: isset($str[$len]) is faster than (strlen($str) > $len),
+            while (isset($line[self::MAX_LINE_LENGTH])) {
+                //Working backwards, try to find a space within the last MAX_LINE_LENGTH chars of the line to break on
+                //so as to avoid breaking in the middle of a word
+                $pos = strrpos(substr($line, 0, self::MAX_LINE_LENGTH), ' ');
+                //Deliberately matches both false and 0
+                if (!$pos) {
+                    //No nice break found, add a hard break
+                    $pos = self::MAX_LINE_LENGTH - 1;
+                    $lines_out[] = substr($line, 0, $pos);
+                    $line = substr($line, $pos);
+                } else {
+                    //Break at the found point
+                    $lines_out[] = substr($line, 0, $pos);
+                    //Move along by the amount we dealt with
+                    $line = substr($line, $pos + 1);
+                }
+                //If processing headers add a LWSP-char to the front of new line RFC822 section 3.1.1
+                if ($in_headers) {
+                    $line = "\t" . $line;
+                }
+            }
+            $lines_out[] = $line;
+
+            //Send the lines to the server
+            foreach ($lines_out as $line_out) {
+                //Dot-stuffing as per RFC5321 section 4.5.2
+                //https://tools.ietf.org/html/rfc5321#section-4.5.2
+                if (!empty($line_out) && $line_out[0] === '.') {
+                    $line_out = '.' . $line_out;
+                }
+                $this->client_send($line_out . static::LE, 'DATA');
+            }
+        }
+
+        //Message data has been sent, complete the command
+        //Increase timelimit for end of DATA command
+        $savetimelimit = $this->Timelimit;
+        $this->Timelimit *= 2;
+        $result = $this->sendCommand('DATA END', '.', 250);
+        $this->recordLastTransactionID();
+        //Restore timelimit
+        $this->Timelimit = $savetimelimit;
+
+        return $result;
+    }
+
+    /**
+     * Send an SMTP HELO or EHLO command.
+     * Used to identify the sending server to the receiving server.
+     * This makes sure that client and server are in a known state.
+     * Implements RFC 821: HELO <SP> <domain> <CRLF>
+     * and RFC 2821 EHLO.
+     *
+     * @param string $host The host name or IP to connect to
+     *
+     * @return bool
+     */
+    public function hello($host = '')
+    {
+        //Try extended hello first (RFC 2821)
+        if ($this->sendHello('EHLO', $host)) {
+            return true;
+        }
+
+        //Some servers shut down the SMTP service here (RFC 5321)
+        if (substr($this->helo_rply, 0, 3) == '421') {
+            return false;
+        }
+
+        return $this->sendHello('HELO', $host);
+    }
+
+    /**
+     * Send an SMTP HELO or EHLO command.
+     * Low-level implementation used by hello().
+     *
+     * @param string $hello The HELO string
+     * @param string $host  The hostname to say we are
+     *
+     * @return bool
+     *
+     * @see hello()
+     */
+    protected function sendHello($hello, $host)
+    {
+        $noerror = $this->sendCommand($hello, $hello . ' ' . $host, 250);
+        $this->helo_rply = $this->last_reply;
+        if ($noerror) {
+            $this->parseHelloFields($hello);
+        } else {
+            $this->server_caps = null;
+        }
+
+        return $noerror;
+    }
+
+    /**
+     * Parse a reply to HELO/EHLO command to discover server extensions.
+     * In case of HELO, the only parameter that can be discovered is a server name.
+     *
+     * @param string $type `HELO` or `EHLO`
+     */
+    protected function parseHelloFields($type)
+    {
+        $this->server_caps = [];
+        $lines = explode("\n", $this->helo_rply);
+
+        foreach ($lines as $n => $s) {
+            //First 4 chars contain response code followed by - or space
+            $s = trim(substr($s, 4));
+            if (empty($s)) {
+                continue;
+            }
+            $fields = explode(' ', $s);
+            if (!empty($fields)) {
+                if (!$n) {
+                    $name = $type;
+                    $fields = $fields[0];
+                } else {
+                    $name = array_shift($fields);
+                    switch ($name) {
+                        case 'SIZE':
+                            $fields = ($fields ? $fields[0] : 0);
+                            break;
+                        case 'AUTH':
+                            if (!is_array($fields)) {
+                                $fields = [];
+                            }
+                            break;
+                        default:
+                            $fields = true;
+                    }
+                }
+                $this->server_caps[$name] = $fields;
+            }
+        }
+    }
+
+    /**
+     * Send an SMTP MAIL command.
+     * Starts a mail transaction from the email address specified in
+     * $from. Returns true if successful or false otherwise. If True
+     * the mail transaction is started and then one or more recipient
+     * commands may be called followed by a data command.
+     * Implements RFC 821: MAIL <SP> FROM:<reverse-path> <CRLF>.
+     *
+     * @param string $from Source address of this message
+     *
+     * @return bool
+     */
+    public function mail($from)
+    {
+        $useVerp = ($this->do_verp ? ' XVERP' : '');
+
+        return $this->sendCommand(
+            'MAIL FROM',
+            'MAIL FROM:<' . $from . '>' . $useVerp,
+            250
+        );
+    }
+
+    /**
+     * Send an SMTP QUIT command.
+     * Closes the socket if there is no error or the $close_on_error argument is true.
+     * Implements from RFC 821: QUIT <CRLF>.
+     *
+     * @param bool $close_on_error Should the connection close if an error occurs?
+     *
+     * @return bool
+     */
+    public function quit($close_on_error = true)
+    {
+        $noerror = $this->sendCommand('QUIT', 'QUIT', 221);
+        $err = $this->error; //Save any error
+        if ($noerror || $close_on_error) {
+            $this->close();
+            $this->error = $err; //Restore any error from the quit command
+        }
+
+        return $noerror;
+    }
+
+    /**
+     * Send an SMTP RCPT command.
+     * Sets the TO argument to $toaddr.
+     * Returns true if the recipient was accepted false if it was rejected.
+     * Implements from RFC 821: RCPT <SP> TO:<forward-path> <CRLF>.
+     *
+     * @param string $address The address the message is being sent to
+     * @param string $dsn     Comma separated list of DSN notifications. NEVER, SUCCESS, FAILURE
+     *                        or DELAY. If you specify NEVER all other notifications are ignored.
+     *
+     * @return bool
+     */
+    public function recipient($address, $dsn = '')
+    {
+        if (empty($dsn)) {
+            $rcpt = 'RCPT TO:<' . $address . '>';
+        } else {
+            $dsn = strtoupper($dsn);
+            $notify = [];
+
+            if (strpos($dsn, 'NEVER') !== false) {
+                $notify[] = 'NEVER';
+            } else {
+                foreach (['SUCCESS', 'FAILURE', 'DELAY'] as $value) {
+                    if (strpos($dsn, $value) !== false) {
+                        $notify[] = $value;
+                    }
+                }
+            }
+
+            $rcpt = 'RCPT TO:<' . $address . '> NOTIFY=' . implode(',', $notify);
+        }
+
+        return $this->sendCommand(
+            'RCPT TO',
+            $rcpt,
+            [250, 251]
+        );
+    }
+
+    /**
+     * Send an SMTP RSET command.
+     * Abort any transaction that is currently in progress.
+     * Implements RFC 821: RSET <CRLF>.
+     *
+     * @return bool True on success
+     */
+    public function reset()
+    {
+        return $this->sendCommand('RSET', 'RSET', 250);
+    }
+
+    /**
+     * Send a command to an SMTP server and check its return code.
+     *
+     * @param string    $command       The command name - not sent to the server
+     * @param string    $commandstring The actual command to send
+     * @param int|array $expect        One or more expected integer success codes
+     *
+     * @return bool True on success
+     */
+    protected function sendCommand($command, $commandstring, $expect)
+    {
+        if (!$this->connected()) {
+            $this->setError("Called $command without being connected");
+
+            return false;
+        }
+        //Reject line breaks in all commands
+        if ((strpos($commandstring, "\n") !== false) || (strpos($commandstring, "\r") !== false)) {
+            $this->setError("Command '$command' contained line breaks");
+
+            return false;
+        }
+        $this->client_send($commandstring . static::LE, $command);
+
+        $this->last_reply = $this->get_lines();
+        //Fetch SMTP code and possible error code explanation
+        $matches = [];
+        if (preg_match('/^([\d]{3})[ -](?:([\d]\\.[\d]\\.[\d]{1,2}) )?/', $this->last_reply, $matches)) {
+            $code = (int) $matches[1];
+            $code_ex = (count($matches) > 2 ? $matches[2] : null);
+            //Cut off error code from each response line
+            $detail = preg_replace(
+                "/{$code}[ -]" .
+                ($code_ex ? str_replace('.', '\\.', $code_ex) . ' ' : '') . '/m',
+                '',
+                $this->last_reply
+            );
+        } else {
+            //Fall back to simple parsing if regex fails
+            $code = (int) substr($this->last_reply, 0, 3);
+            $code_ex = null;
+            $detail = substr($this->last_reply, 4);
+        }
+
+        $this->edebug('SERVER -> CLIENT: ' . $this->last_reply, self::DEBUG_SERVER);
+
+        if (!in_array($code, (array) $expect, true)) {
+            $this->setError(
+                "$command command failed",
+                $detail,
+                $code,
+                $code_ex
+            );
+            $this->edebug(
+                'SMTP ERROR: ' . $this->error['error'] . ': ' . $this->last_reply,
+                self::DEBUG_CLIENT
+            );
+
+            return false;
+        }
+
+        //Don't clear the error store when using keepalive
+        if ($command !== 'RSET') {
+            $this->setError('');
+        }
+
+        return true;
+    }
+
+    /**
+     * Send an SMTP SAML command.
+     * Starts a mail transaction from the email address specified in $from.
+     * Returns true if successful or false otherwise. If True
+     * the mail transaction is started and then one or more recipient
+     * commands may be called followed by a data command. This command
+     * will send the message to the users terminal if they are logged
+     * in and send them an email.
+     * Implements RFC 821: SAML <SP> FROM:<reverse-path> <CRLF>.
+     *
+     * @param string $from The address the message is from
+     *
+     * @return bool
+     */
+    public function sendAndMail($from)
+    {
+        return $this->sendCommand('SAML', "SAML FROM:$from", 250);
+    }
+
+    /**
+     * Send an SMTP VRFY command.
+     *
+     * @param string $name The name to verify
+     *
+     * @return bool
+     */
+    public function verify($name)
+    {
+        return $this->sendCommand('VRFY', "VRFY $name", [250, 251]);
+    }
+
+    /**
+     * Send an SMTP NOOP command.
+     * Used to keep keep-alives alive, doesn't actually do anything.
+     *
+     * @return bool
+     */
+    public function noop()
+    {
+        return $this->sendCommand('NOOP', 'NOOP', 250);
+    }
+
+    /**
+     * Send an SMTP TURN command.
+     * This is an optional command for SMTP that this class does not support.
+     * This method is here to make the RFC821 Definition complete for this class
+     * and _may_ be implemented in future.
+     * Implements from RFC 821: TURN <CRLF>.
+     *
+     * @return bool
+     */
+    public function turn()
+    {
+        $this->setError('The SMTP TURN command is not implemented');
+        $this->edebug('SMTP NOTICE: ' . $this->error['error'], self::DEBUG_CLIENT);
+
+        return false;
+    }
+
+    /**
+     * Send raw data to the server.
+     *
+     * @param string $data    The data to send
+     * @param string $command Optionally, the command this is part of, used only for controlling debug output
+     *
+     * @return int|bool The number of bytes sent to the server or false on error
+     */
+    public function client_send($data, $command = '')
+    {
+        //If SMTP transcripts are left enabled, or debug output is posted online
+        //it can leak credentials, so hide credentials in all but lowest level
+        if (
+            self::DEBUG_LOWLEVEL > $this->do_debug &&
+            in_array($command, ['User & Password', 'Username', 'Password'], true)
+        ) {
+            $this->edebug('CLIENT -> SERVER: [credentials hidden]', self::DEBUG_CLIENT);
+        } else {
+            $this->edebug('CLIENT -> SERVER: ' . $data, self::DEBUG_CLIENT);
+        }
+        set_error_handler([$this, 'errorHandler']);
+        $result = fwrite($this->smtp_conn, $data);
+        restore_error_handler();
+
+        return $result;
+    }
+
+    /**
+     * Get the latest error.
+     *
+     * @return array
+     */
+    public function getError()
+    {
+        return $this->error;
+    }
+
+    /**
+     * Get SMTP extensions available on the server.
+     *
+     * @return array|null
+     */
+    public function getServerExtList()
+    {
+        return $this->server_caps;
+    }
+
+    /**
+     * Get metadata about the SMTP server from its HELO/EHLO response.
+     * The method works in three ways, dependent on argument value and current state:
+     *   1. HELO/EHLO has not been sent - returns null and populates $this->error.
+     *   2. HELO has been sent -
+     *     $name == 'HELO': returns server name
+     *     $name == 'EHLO': returns boolean false
+     *     $name == any other string: returns null and populates $this->error
+     *   3. EHLO has been sent -
+     *     $name == 'HELO'|'EHLO': returns the server name
+     *     $name == any other string: if extension $name exists, returns True
+     *       or its options (e.g. AUTH mechanisms supported). Otherwise returns False.
+     *
+     * @param string $name Name of SMTP extension or 'HELO'|'EHLO'
+     *
+     * @return string|bool|null
+     */
+    public function getServerExt($name)
+    {
+        if (!$this->server_caps) {
+            $this->setError('No HELO/EHLO was sent');
+
+            return null;
+        }
+
+        if (!array_key_exists($name, $this->server_caps)) {
+            if ('HELO' === $name) {
+                return $this->server_caps['EHLO'];
+            }
+            if ('EHLO' === $name || array_key_exists('EHLO', $this->server_caps)) {
+                return false;
+            }
+            $this->setError('HELO handshake was used; No information about server extensions available');
+
+            return null;
+        }
+
+        return $this->server_caps[$name];
+    }
+
+    /**
+     * Get the last reply from the server.
+     *
+     * @return string
+     */
+    public function getLastReply()
+    {
+        return $this->last_reply;
+    }
+
+    /**
+     * Read the SMTP server's response.
+     * Either before eof or socket timeout occurs on the operation.
+     * With SMTP we can tell if we have more lines to read if the
+     * 4th character is '-' symbol. If it is a space then we don't
+     * need to read anything else.
+     *
+     * @return string
+     */
+    protected function get_lines()
+    {
+        //If the connection is bad, give up straight away
+        if (!is_resource($this->smtp_conn)) {
+            return '';
+        }
+        $data = '';
+        $endtime = 0;
+        stream_set_timeout($this->smtp_conn, $this->Timeout);
+        if ($this->Timelimit > 0) {
+            $endtime = time() + $this->Timelimit;
+        }
+        $selR = [$this->smtp_conn];
+        $selW = null;
+        while (is_resource($this->smtp_conn) && !feof($this->smtp_conn)) {
+            //Must pass vars in here as params are by reference
+            //solution for signals inspired by https://github.com/symfony/symfony/pull/6540
+            set_error_handler([$this, 'errorHandler']);
+            $n = stream_select($selR, $selW, $selW, $this->Timelimit);
+            restore_error_handler();
+
+            if ($n === false) {
+                $message = $this->getError()['detail'];
+
+                $this->edebug(
+                    'SMTP -> get_lines(): select failed (' . $message . ')',
+                    self::DEBUG_LOWLEVEL
+                );
+
+                //stream_select returns false when the `select` system call is interrupted
+                //by an incoming signal, try the select again
+                if (stripos($message, 'interrupted system call') !== false) {
+                    $this->edebug(
+                        'SMTP -> get_lines(): retrying stream_select',
+                        self::DEBUG_LOWLEVEL
+                    );
+                    $this->setError('');
+                    continue;
+                }
+
+                break;
+            }
+
+            if (!$n) {
+                $this->edebug(
+                    'SMTP -> get_lines(): select timed-out in (' . $this->Timelimit . ' sec)',
+                    self::DEBUG_LOWLEVEL
+                );
+                break;
+            }
+
+            //Deliberate noise suppression - errors are handled afterwards
+            $str = @fgets($this->smtp_conn, self::MAX_REPLY_LENGTH);
+            $this->edebug('SMTP INBOUND: "' . trim($str) . '"', self::DEBUG_LOWLEVEL);
+            $data .= $str;
+            //If response is only 3 chars (not valid, but RFC5321 S4.2 says it must be handled),
+            //or 4th character is a space or a line break char, we are done reading, break the loop.
+            //String array access is a significant micro-optimisation over strlen
+            if (!isset($str[3]) || $str[3] === ' ' || $str[3] === "\r" || $str[3] === "\n") {
+                break;
+            }
+            //Timed-out? Log and break
+            $info = stream_get_meta_data($this->smtp_conn);
+            if ($info['timed_out']) {
+                $this->edebug(
+                    'SMTP -> get_lines(): stream timed-out (' . $this->Timeout . ' sec)',
+                    self::DEBUG_LOWLEVEL
+                );
+                break;
+            }
+            //Now check if reads took too long
+            if ($endtime && time() > $endtime) {
+                $this->edebug(
+                    'SMTP -> get_lines(): timelimit reached (' .
+                    $this->Timelimit . ' sec)',
+                    self::DEBUG_LOWLEVEL
+                );
+                break;
+            }
+        }
+
+        return $data;
+    }
+
+    /**
+     * Enable or disable VERP address generation.
+     *
+     * @param bool $enabled
+     */
+    public function setVerp($enabled = false)
+    {
+        $this->do_verp = $enabled;
+    }
+
+    /**
+     * Get VERP address generation mode.
+     *
+     * @return bool
+     */
+    public function getVerp()
+    {
+        return $this->do_verp;
+    }
+
+    /**
+     * Set error messages and codes.
+     *
+     * @param string $message      The error message
+     * @param string $detail       Further detail on the error
+     * @param string $smtp_code    An associated SMTP error code
+     * @param string $smtp_code_ex Extended SMTP code
+     */
+    protected function setError($message, $detail = '', $smtp_code = '', $smtp_code_ex = '')
+    {
+        $this->error = [
+            'error' => $message,
+            'detail' => $detail,
+            'smtp_code' => $smtp_code,
+            'smtp_code_ex' => $smtp_code_ex,
+        ];
+    }
+
+    /**
+     * Set debug output method.
+     *
+     * @param string|callable $method The name of the mechanism to use for debugging output, or a callable to handle it
+     */
+    public function setDebugOutput($method = 'echo')
+    {
+        $this->Debugoutput = $method;
+    }
+
+    /**
+     * Get debug output method.
+     *
+     * @return string
+     */
+    public function getDebugOutput()
+    {
+        return $this->Debugoutput;
+    }
+
+    /**
+     * Set debug output level.
+     *
+     * @param int $level
+     */
+    public function setDebugLevel($level = 0)
+    {
+        $this->do_debug = $level;
+    }
+
+    /**
+     * Get debug output level.
+     *
+     * @return int
+     */
+    public function getDebugLevel()
+    {
+        return $this->do_debug;
+    }
+
+    /**
+     * Set SMTP timeout.
+     *
+     * @param int $timeout The timeout duration in seconds
+     */
+    public function setTimeout($timeout = 0)
+    {
+        $this->Timeout = $timeout;
+    }
+
+    /**
+     * Get SMTP timeout.
+     *
+     * @return int
+     */
+    public function getTimeout()
+    {
+        return $this->Timeout;
+    }
+
+    /**
+     * Reports an error number and string.
+     *
+     * @param int    $errno   The error number returned by PHP
+     * @param string $errmsg  The error message returned by PHP
+     * @param string $errfile The file the error occurred in
+     * @param int    $errline The line number the error occurred on
+     */
+    protected function errorHandler($errno, $errmsg, $errfile = '', $errline = 0)
+    {
+        $notice = 'Connection failed.';
+        $this->setError(
+            $notice,
+            $errmsg,
+            (string) $errno
+        );
+        $this->edebug(
+            "$notice Error #$errno: $errmsg [$errfile line $errline]",
+            self::DEBUG_CONNECTION
+        );
+    }
+
+    /**
+     * Extract and return the ID of the last SMTP transaction based on
+     * a list of patterns provided in SMTP::$smtp_transaction_id_patterns.
+     * Relies on the host providing the ID in response to a DATA command.
+     * If no reply has been received yet, it will return null.
+     * If no pattern was matched, it will return false.
+     *
+     * @return bool|string|null
+     */
+    protected function recordLastTransactionID()
+    {
+        $reply = $this->getLastReply();
+
+        if (empty($reply)) {
+            $this->last_smtp_transaction_id = null;
+        } else {
+            $this->last_smtp_transaction_id = false;
+            foreach ($this->smtp_transaction_id_patterns as $smtp_transaction_id_pattern) {
+                $matches = [];
+                if (preg_match($smtp_transaction_id_pattern, $reply, $matches)) {
+                    $this->last_smtp_transaction_id = trim($matches[1]);
+                    break;
+                }
+            }
+        }
+
+        return $this->last_smtp_transaction_id;
+    }
+
+    /**
+     * Get the queue/transaction ID of the last SMTP transaction
+     * If no reply has been received yet, it will return null.
+     * If no pattern was matched, it will return false.
+     *
+     * @return bool|string|null
+     *
+     * @see recordLastTransactionID()
+     */
+    public function getLastTransactionID()
+    {
+        return $this->last_smtp_transaction_id;
+    }
+}