Please I need help. I keep receiving this error message even I put the right format on email address field.

// Contact form.php

<?php 
// ob_start()

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();

    if(!$mail->ValidateAddress($mail)){
        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;

header("Location: contact.php?status=thanks");
exit;
}
    // TODO: Send Email


// ob_flush(); 
?>
<?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>Thanks for the email! I&rsquo;ll be in touch shortly.</p>
    <?php } else { ?>

    <p>I&rsquo;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 style="display: none;">
            <th>

            <label for="address">Address</label>    
        </th>
            <td>
                <input type="text" name="address" id="address">
                <p>Humans (and frogs): please leave this field blank.</p>
            </td>
        </tr>



        </table>

        <input type="submit" value="Send">

    </form>

    <?php } ?>

        </div> <!-- wrapper -->
    </div> <!-- section page -->
<?php include('inc/footer.php'); ?>

// class.phpmailer.php the last line is the 919

return (boolean)preg_match(
        '/^(?!(?>(?1)"?(?>\\\[ -~]|[^"])"?(?1)){255,})(?!(?>(?1)"?(?>\\\[ -~]|[^"])"?(?1)){65,}@)' .
                    '((?>(?>(?>((?>(?>(?>\x0D\x0A)?[\t ])+|(?>[\t ]*\x0D\x0A)?[\t ]+)?)(\((?>(?2)' .
                    '(?>[\x01-\x08\x0B\x0C\x0E-\'*-\[\]-\x7F]|\\\[\x00-\x7F]|(?3)))*(?2)\)))+(?2))|(?2))?)' .
                    '([!#-\'*+\/-9=?^-~-]+|"(?>(?2)(?>[\x01-\x08\x0B\x0C\x0E-!#-\[\]-\x7F]|\\\[\x00-\x7F]))*' .
                    '(?2)")(?>(?1)\.(?1)(?4))*(?1)@(?!(?1)[a-z0-9-]{64,})(?1)(?>([a-z0-9](?>[a-z0-9-]*[a-z0-9])?)' .
                    '(?>(?1)\.(?!(?1)[a-z0-9-]{64,})(?1)(?5)){0,126}|\[(?:(?>IPv6:(?>([a-f0-9]{1,4})(?>:(?6)){7}' .
                    '|(?!(?:.*[a-f0-9][:\]]){8,})((?6)(?>:(?6)){0,6})?::(?7)?))|(?>(?>IPv6:(?>(?6)(?>:(?6)){5}:' .
                    '|(?!(?:.*[a-f0-9]:){6,})(?8)?::(?>((?6)(?>:(?6)){0,4}):)?))?(25[0-5]|2[0-4][0-9]|1[0-9]{2}' .
                    '|[1-9]?[0-9])(?>\.(?9)){3}))\])(?1)$/isD',
                    $address
                );

// Appreciate your help. Thanks.