Trying to set up a working email, with SMTP Postmarkapp, but nothing displays when I've sent the email

Question

Hi All this is my first experience with PHP and I am trying to set up a contact page with a third party mail server. The mail server I am using is Postmarkapp and every time I submit the form a blank index.php page returns, instead of the contact.php?status=thanks page. Any help or advice will be much appreciated as I am currently bamboozled!! Here is the code below:

<?php

if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $name = trim($_POST["name"]);
    $email = trim($_POST["email"]);
    $message = trim($_POST["message"]);

    if($name == "" OR $email == "" OR $message =="") {
        echo "You must specify a value for name, email address and message.";
        exit;
    }

    foreach( $_POST as $value ){
        if( stripos($value,'Content-Type:') !== FALSE ){
            echo "There was a problem with the information you entered.";
            exit;
        }
    }

    if ($_POST["address"] != "") {
        echo "Your form submission has an error.";
        exit;
    }

    require_once("inc/phpmailer/class.phpmailer.php");
    $mail = new PHPMailer(); // defaults to using php "mail()"

    if (!$mail->ValidateAddress($email)){
        echo"You must specify a vaild email address.";
        exit;
    }

    $email_body = "";
    $email_body = $email_body . "Name: " . $name . "<br>";
    $email_body = $email_body . "Email: " . $email . "<br>";
    $email_body = $email_body . "Message: " . $message;


    $mail->isSMPT();
    $mail->SMTPAuth = true;


    $mail->Host = 'smtp.postmarkapp.com';
    $mail->Username = 'myusername';
    $mail->Password = 'mypassword';
    $mail->SMTPSecure = 'ssl';
    $mail->Port = 465;

    $mail->SetFrom($email, $name);
    $address = "sukhjinder.bansil@gmail.com";
    $mail->AddAddress($address, "Sukh Bansil");
    $mail->Subject    = "Sukh Bansil Web Developer Form Submission | " . $name;
    $mail->MsgHTML($email_body);



    if(!$mail->Send()) {
      echo "There was a problem sending the email: " . $mail->ErrorInfo;
      exit;
    }

    header("Location: contact.php?status=thanks");
    exit;
}
?><?php
include('inc/header.php');
include('inc/body.php'); ?>

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Sukhjinder Bansil

Sukhjinder Bansil

Trying to set up a working email, with SMTP Postmarkapp, but nothing displays when I've sent the email