ช่วยดูโค้ดหน่อยครับส่งเข้า hotmail ได้แต่พอส่งเข้า gmail ไม่ได้ครับ

<?php

	
	require_once('class.phpmailer.php');

	$mail = new PHPMailer();
	$mail->IsHTML(true);
	$mail->IsSMTP();
	$mail->CharSet = 'UTF-8';
	$mail->SMTPAuth = true; // enable SMTP authentication
	$mail->SMTPDebug = 0; // enables SMTP debug information (for testing)
	$mail->SMTPSecure = ""; // sets the prefix to the servier
	$mail->Host = "202.44.52.2"; // sets GMAIL as the SMTP server
	$mail->Port = 25; // set the SMTP port for the GMAIL server
	$mail->Username = "[email protected]"; // GMAIL username
	$mail->Password = "1234"; // GMAIL password
	$mail->From = "[email protected]"; // "[email protected]";
	//$mail->AddReplyTo = "[email protected]"; // Reply
	$mail->FromName = "Mr.Weerachai Nukitram";  // set from Name
	$mail->Subject = "Test sending mail."; 
	$mail->Body = "My Body & <b>My Description</b>";

	$mail->AddAddress("[email protected]", "Mr.wisanu Khamcheun"); // to Address

	$mail->Send(); 
?>