PHP Form Sadly Not Working...

<?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("class.phpmailer.php");
    $mail = new PHPMailer();

    if (!$mail->ValidateAddress($email)){
        echo "You must specify a valid 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;

    $mail->SetFrom($email, $name);
    $address = "rachelbeen@gmail.com";
    $mail->AddAddress($address, "Shirts 4 Mike");
    $mail->Subject    = "Shirts 4 Mike Contact 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;
}
?>