Validating Contact Form Data - problem with validation

           <?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
$name = trim($_POST["name"]);
$email = trim($_POST["email"]);
$message = trim($_POST["message"]);
if ($name == "" OR $email == "" OR $message == "") {
echo "You must specify a value for name, email address, and message.";
exit;
}
//security matters
foreach ($_POST as $value) {
    if (stripos($value, 'Content-Type:') !== FALSE){
        echo "There was an error with forms.";
        exit();
    }
}
//fake input field (adress)
if ($_POST["adress"] != "") {
    echo "Form submission have error!";
    exit();
}

$email_body = "";
$email_body .= "Name: ". $name . "\n";
$email_body .= "E mail: ". $email. "\n";
$email_body .= "Message: ". $message. "\n";
//TODO Send e mail
header("Location: contact.php?status=thanks");
exit;
}
?>
<?php
$pageTitle = "Contact Mike";
$section = "contact";
include('includes/header.php');
?>
<div class="section page">
    <div class="wrapper">
        <h1>Contact</h1>
        <?php if (isset($_GET["status"]) AND ($_GET["status"])=="thanks"){ ?>
        <p>Thank you for sending email. We will answer you shortly</p>
        <?php } else { ?>
        <p>I would love to hear from you! Complete the form to send me an mail.</p>
        <form method="post" action="contact-thanks.php">
            <table>
                <tr>
                    <th>
                        <label for="name">Name</label>
                    </th>
                    <td>
                        <input type="text" name="name" id="name">
                    </td>
                </tr>
                <tr>
                    <th>
                        <label for="emai">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;"> <!-- Fake field only for bots -->
                    <th>
                        <label for="emai">Adress</label>
                    </th>
                    <td>
                        <input type="text" name="adress" id="adress">
                    </td>
                </tr>
            </table>
            <input type="submit" value="send">
        </form>
    </div>
    <?php } ?>
    <?php
    include('includes/footer.php');
    ?>
            ```