app/libs/Mailer/SMTP.php

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<?php
namespace WY\app\libs\Mailer;

/**
 * PHPMailer RFC821 SMTP email transport class.
 * PHP Version 5
 * @package PHPMailer
 * @link 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 2014 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.
 */

/**
 * PHPMailer RFC821 SMTP email transport class.
 * Implements RFC 821 SMTP commands and provides some utility methods for sending mail to an SMTP server.
 * @package PHPMailer
 * @author Chris Ryan
 * @author Marcus Bointon <phpmailer@synchromedia.co.uk>
 */
class SMTP
{
    /**
     * The PHPMailer SMTP version number.
     * @var string
     */
    const VERSION = '5.2.14';

    /**
     * SMTP line break constant.
     * @var string
     */
    const CRLF = "\r\n";

    /**
     * The SMTP port to use if one is not specified.
     * @var integer
     */
    const DEFAULT_SMTP_PORT = 25;

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

    /**
     * Debug level for no output
     */
    const DEBUG_OFF = 0;

    /**