问.SMTP错误:无法连接到SMTP主机

EN

<?php
   require_once('././php_mailer/class.phpmailer.php');
   $mail = new PHPMailer(true); // the true param means it will throw exceptions on errors, which we need to catch

   $mail->IsSMTP(); // telling the class to use SMTP

   try {
       $mail->Host       = 'tls://mail.sipradi.com.np'; // SMTP server
        $mail->SMTPDebug  = 2;                     // enables SMTP debug information (for testing)
        $mail->SMTPAuth   = true;                  // enable SMTP authentication
        $mail->Host       = 'tls://mail.sipradi.com.np'; // sets the SMTP server
        $mail->Port       = 25;                    // set the SMTP port for the GMAIL server
        $mail->Username   = 'user_name'; // SMTP account username
        $mail->Password   = 'pass';        // SMTP account password
        $mail->AddAddress('something@sipradi.com.np', 'Full Name');

        $mail->SetFrom('user_name', '<noreply@sipradi.com.np>');
        $mail->Subject = $subject;
        $mail->AltBody = 'To view the message, please use an HTML compatible email viewer!'; // optional - MsgHTML will create an alternate automatically
        $mail->MsgHTML($message);
        if($mail->Send()){
         echo "Message Sent OK<p></p>\n"; die;
        }else{
         echo 'fail'; die;`
`
        }
    } catch (phpmailerException $e) {
        echo $e->errorMessage(); //Pretty error messages from PHPMailer
    } catch (Exception $e) {
        echo $e->getMessage(); //Boring error messages from anything else!
}
?>