Contact Form Validation Not Throwing Error

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

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

foreach($_POST as $value ) {
    if( stripost($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 "This email won't work, sorry!";
    exit;
}

$email_body = "";
$email_body = $email_body . "Name: " . $name . "<br>";
$email_body = $email_body . "Email: " . $email . "<br>";
$email_body = $email_body . "Message: " . $message;
//  $body             = file_get_contents('contents.html');
//  $body             = preg_replace('/[\]/','',$body);

$mail->SetFrom($email, $name);
$address = "whoto@otherdomain.com";
$mail->AddAddress($address, "John Doe");
$mail->Subject = "Shirts 4 Mike Contact Form Submission | " . $name;

//  $mail->AltBody    = "To view the message, please use an HTML compatible email viewer!"; // optional, comment out and test

$mail->MsgHTML($email_body);
//  $mail->AddAttachment("images/phpmailer.gif");      // attachment
//  $mail->AddAttachment("images/phpmailer_mini.gif"); // attachment

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

header("Location: contact.php?status=thanks");
exit;
}
 ?>

 <?php 
$pageTitle = "Contact Mike";
$section = "contact";
include('inc/header.php'); ?>

<div class="section page">

<div class="wrapper">
<h1>Contact</h1>

<?PHP
if(isset($_GET["Status"]) AND $_GET["Status"] == "thanks") { ?>

<p>Thank you for the email. We'll reply soon, we swear.</p>


<?php } else {?>

<p>

<form method="post" action="contact-process.php">
    <table>
        <tr>
            <th>
                <label for="name">Name</label>
            </th>
            <td>
                <input type="text" name="name" id="name">
            </td>
        </tr>
        <tr>
            <th>
                <label for="email">Email</label>
            </th>
            <td>
                <input type="text" name="email" id="email">
            </td>
        </tr>
        <tr>
            <th>
                <label for="message">Message</label>
            </th>
            <td>
                <textarea name="message" id="message"></textarea>
            </td>
        </tr>
        <tr style="display:none;">
            <th>
                <label for="address">Address</label>
            </th>
            <td>
                <input type="text" name="address" id="address">
                <p> Human! Leave this blank!</p>
            </td>
        </tr>
    </table>
    <input  type="submit" value="Send">
</form>


<?php } ?>

</div>
</div>
<?php include('inc/footer.php'); ?>