Nothing changes after I add the phpmailer code, any ideas?

<?php
//checks to see if the form has been submitted below
If ($_SERVER["REQUEST_METHOD"] == "POST") {
    $name = trim($_POST["name"]);
    $email = trim($_POST["email"]);
    $message = trim($_POST["message"]);
    $reason = trim($_POST["reason"]);

    if ($name == "" || $email == "" || $message == "") {
        echo "You must enter 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 from submission has an error.";
        exit;
    }

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

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

    //stores the form data in a variable
    $email_body =  "";
    $email_body = $email_body . "Name: " . $name . "\n";
    $email_body = $email_body . "Email: " . $email . "\n";
    $email_body = $email_body . "Message: " . $message . "\n";
    $email_body = $email_body . "Reason: " . $reason . "\n";

    //TODO: Send email

    header("Location: contact.php?status=thanks");
    exit; 
}
//declares variables to be used in header.php
$pageTitle = "Contact Mike"; 
$page = "contact";

//includes header.php
include('inc/header.php'); 
?>

<!-- Start of Contact Page -->
    <div class="section page">

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

            <?php if (isset($_GET["status"]) && $_GET["status"] == "thanks") { ?>

                <p>Thanks for the email! I'll be in touch shortly!</p>

            <?php } else { ?>                   

                <p>I'd love to hear from you! Complete the form to send me an email!</p>

                <form method="post" action="contact.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>
                            <th>
                                <label for="reason">Reason For Inquiry</label>
                            </th>
                            <td>
                                <select id="reason">
                                    <option>Fault</option>
                                    <option>Query</option>
                                    <option>Other</option>
                                </select>
                        </tr>

                        <tr style="display: none;">
                            <th>
                                <label for="address">Address</label>
                            </th>
                            <td>
                                <textarea id="address" name="address"></textarea>
                                <p> **Not to be filled out** </p>
                        </tr>
                    </table>
                    <input type="submit" value="submit">
                </form>
            <?php } ?>
        </div><!-- End wrapper -->

    </div> ><!-- End section page -->
<!-- End of Contact Page -->

<!-- Includes footer.php -->
<?php include('inc/footer.php'); ?>