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Filename : smtp_check.phps
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<?php
/**
 * This uses the SMTP class alone to check that a connection can be made to an SMTP server,
 * authenticate, then disconnect
 */

//SMTP needs accurate times, and the PHP time zone MUST be set
//This should be done in your php.ini, but this is how to do it if you don't have access to that
date_default_timezone_set('Etc/UTC');

require '../PHPMailerAutoload.php';

//Create a new SMTP instance
$smtp = new SMTP;

//Enable connection-level debug output
$smtp->do_debug = SMTP::DEBUG_CONNECTION;

try {
    //Connect to an SMTP server
    if (!$smtp->connect('mail.example.com', 25)) {
        throw new Exception('Connect failed');
    }
    //Say hello
    if (!$smtp->hello(gethostname())) {
        throw new Exception('EHLO failed: ' . $smtp->getError()['error']);
    }
    //Get the list of ESMTP services the server offers
    $e = $smtp->getServerExtList();
    //If server can do TLS encryption, use it
    if (is_array($e) && array_key_exists('STARTTLS', $e)) {
        $tlsok = $smtp->startTLS();
        if (!$tlsok) {
            throw new Exception('Failed to start encryption: ' . $smtp->getError()['error']);
        }
        //Repeat EHLO after STARTTLS
        if (!$smtp->hello(gethostname())) {
            throw new Exception('EHLO (2) failed: ' . $smtp->getError()['error']);
        }
        //Get new capabilities list, which will usually now include AUTH if it didn't before
        $e = $smtp->getServerExtList();
    }
    //If server supports authentication, do it (even if no encryption)
    if (is_array($e) && array_key_exists('AUTH', $e)) {
        if ($smtp->authenticate('username', 'password')) {
            echo "Connected ok!";
        } else {
            throw new Exception('Authentication failed: ' . $smtp->getError()['error']);
        }
    }
} catch (Exception $e) {
    echo 'SMTP error: ' . $e->getMessage(), "\n";
}
//Whatever happened, close the connection.
$smtp->quit(true);