My Code is coming up with all the possible errors if it exists whats wrong?

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $name = trim($_POST['name']);
    $email = trim($_POST['email']);
    $message = trim($_POST['message']);
    $error_message = array (
        "all" => "You did not specify name, email and Message!",
        "info" => "There was a problem with the information you entered.",
        "submission" => "Your form submission has an error.",
        "email" => "you must specify a valid email address.",
        "declined" => "There was a problem sending the email:"

    );

    if ($name = "" or $email == "" or $message = "") {
        $error_message["all"];  
    }


    if (!isset($error_message)) {
        foreach ($_POST as $value) {
            if( stripos($value,'Content-Type:') != FALSE) {
                $error_message["info"]; 
            }
        }

        if (!isset($error_message) AND $_POST["address"] != "") {
            $error_message["submission"];
        }

        require_once("inc/phpmailer/class.phpmailer.php");
        $mail = new PHPMailer();
        if (!$mail ->ValidateAddress($email)); {

            $error_message["email"];
        }
    }
    if (!isset($error_message)) {
            $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 = "orders@shirts4mike.com";
            $mail->AddAddress($address, "Shirts 4 Mike");
            $mail->Subject    = "Shirts 4 Mike Contact Form Submission |" . $name;
            $mail->MsgHTML($email_body);

                if($mail->Send()) {
                    header("Location: contact.php?status=thanks");
                    exit;                   
                } else {    
                    $error_message["declined"];
                }


} }
?>



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



        <div class="section page">

        <div id="wrapper">

                    <h1>Contact</h1>

                    <?php if (isset($_GET["status"]) and $_GET["status"] == "thanks") { ?>
                        <p>Thanks for the Email I will Get Back to you Shortly</p>
                    <?php   
                    } else { ?>



                    <?php if(!isset($error_message)) {
                        echo "<p>I would like to hear from you!</p>";
                    } else {
                        if (isset($error_message)) {
                            foreach ($error_message as $error) {                
                        echo '<p class="message">' . $error . '</p>';
                          }
                        }   
                    }

                    ?>
                    <form method="post" action="contact.php">
                        <table>
                          <tr>
                            <th><label for="name">Name</label></th><td><input type="text" name="name" id="name" value="<?php if (isset($name)) { echo htmlspecialchars($name); } ?>" ></td>
                          </tr>
                          <tr>
                            <th><label for="email">Email</label></th><td><input type="text" name="email" id="email" value="<?php if (isset($email)) { echo htmlspecialchars($email); } ?>" ></td>
                          </tr>
                          <tr>
                            <th><label for="message">Message</label></th><td><textarea name="message" id="message" ><?php if (isset($message)) { echo htmlspecialchars($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 pleas do not fill in this field</p></td>
                          </tr>
                        </table>
                        <input type="submit" value="Send">
                    </form> <?php } ?>

        </div>

    </div>

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