ช่วยหน่อยค่า contact form ส่ง email ไม่ไป แต่อีก server ส่งออกได้ ทั้งที่ code เดียวกัน

require 'mail/PHPMailerAutoload.php';
    $mail = new PHPMailer;
    $mail->CharSet = 'utf-8';
    $mail->IsSMTP();
    $mail->SMTPAuth = true;
    $mail->Host = "mail.xxx.com";
    $mail->Port = 25;
    $mail->Username = "[email protected]";
    $mail->Password = "xxx";
    $mail->SetFrom($_POST["email"], $_POST["name"]);
    $mail->AddReplyTo($_POST["email"], $_POST["name"]);
    $mail->Subject = "Contact US";
    $mail->Body = "...";
    $mail->AddAddress("[email protected]", "Reservations");
    
    if (!$mail->Send()) {
        echo "Error: " . $mail->ErrorInfo;
        echo "<br>Your Message could not be sent. ";
    } else {
        echo "Your enquiry has been sent.";
    }

$mail->SMTPOptions = array(
    'ssl' => array(
        'verify_peer' => false,
        'verify_peer_name' => false,
        'allow_self_signed' => true
    )
);