สอบถามเรืองการส่ง mail ผ่านหน้าเว็บไซต์ครับ เกิน ERROR: smtp error could not connect to smtp host

<meta http-equiv="Content-Type" content="text/html; charset=tis-620"> 
<?php
	require_once('class.phpmailer.php');

	$mail = new PHPMailer();
	$mail->IsHTML(true);
	$mail->IsSMTP();
	$mail->SMTPAuth = true; 
	$mail->SMTPSecure = ""; 
	$mail->Host = "mail.xxx.com"; 
	$mail->Port = 25; 
	$mail->Username = "[email protected]"; 
	$mail->Password = "admin@xxx"; 
	$mail->From = "[email protected]"; 
	
	$mail->FromName = "XXX.COM";  
	$mail->Subject = "ORDER BY XXX.COM"; 
	$mail->Body = "Thank you ".$_GET["name"]." ".$_GET["lname"]."<br>
	Link Order : http://www.xxx.com/pdf/".$_GET["type"].".php?productid=".$_GET["productid"]."";
	$mail->AddAddress("[email protected]", "ADMIN BY XXX.COM");
	$mail->AddAddress("".$_GET["email"]."", "CUSTOMER"); 
	$mail->Send(); 
	if($mail)
		{
			echo "	<script language='javascript'>
					window.location='payment.php';
					</script>
				 ";
		}else
		{
			echo "	<script language='javascript'>
					window.location='order_home.php';
					</script>
				 ";
		}
?>