โค้ดส่งเมล์เหมือนกัน แต่ appserv ส่งออก แต่ xampp ส่งเมล์ไม่ออก

<?php

$from = '[email protected]';
$fromname = 'Email Test';
$to = "[email protected]";

require_once('PHPMailer_5.2.4/class.phpmailer.php');

try {
$mail = new PHPMailer(true);

$body =("test");

$mail->CharSet = "utf-8";
$mail->IsSMTP();
$mail->SMTPAuth   = true;
$mail->SMTPSecure = 'ssl';
$mail->Port       = 465;
$mail->Host       = "xxx";
$mail->Username   = "xxx";
$mail->Password   = "xxx";

$mail->SMTPDebug = 0;
$mail->From       = $from;
$mail->FromName = $fromname;
$mail->AddAddress($to);

$mail->Subject = "Email Test";
$mail->Body = $body;

$mail->IsHTML(true);

$mail->Send();

echo "<script>alert('Message/Feedback has been sent.');</script>";

} catch (phpmailerException $e) {
	echo $e->errorMessage();
}
?>