PHP SMTP邮件需要在sitemailxchange.gate.com上配置我的代码是否正确

Question

is my code correct or give some suggestion for sitemailxchange host and with port number..? i have check most of combination . Thanks in advance.

    require("class.phpmailer.php");

    $mail = new PHPMailer();


    $mail->IsSMTP();

    $mail->SMTPDebug  = 1;
    $mail->SMTPAuth   = true;                  
    //$mail->SMTPSecure = "ssl";                 
    $mail->Host       = "smtp.sitemailxchange.gate.com";      
    $mail->Port       = 587;               
    $mail->Username   = "[e-mail]";  
    $mail->Password   = "password";      

    $mail->SetFrom('[e-mail]');

    $mail->AddReplyTo("[e-mail]");

    $mail->Subject    = "PHPMailer Test Subject via smtp (Gmail), basic";

    $mail->AltBody    = "To view the message,  viewer!";     
    $mail->MsgHTML($body);

    $address = "[e-mail]";
    $mail->AddAddress($address, "John Doe");

    if(!$mail->Send()) {
      echo "Mailer Error: " . $mail->ErrorInfo;
    } else {
      echo "Message sent!";
    }