Php form validation issues

$name = trim($_POST["name"]);
$email = trim($_POST["email"]);
$message = trim($_POST["message"]);

    foreach( $_POST as $value ){
        if( stripos($value,'Content-Type:') !== FALSE ){
            echo "There was a problem with the information you entered.#3v1lSp4m80t";    
            exit;
        }
    }
        if ($_POST["address"] != "") {
        echo "Your form submission has an error. #h0n3yp0t7r4p  ";
        exit;
    }
        if($message == "") {
        header("Location: contact.php?status=error");
        exit;
    }


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


$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 = "david@nothing-nowhere.co.uk";
    $mail->AddAddress($address, "NothingNowhere");
    $mail->Subject    = "NothingNowhere Contact Form Submission | " . $name;
    $mail->MsgHTML($email_body);

    if(!$mail->Send()) {
    header("Location: contact.php?status=emailError");
    exit;
    }


header("Location: contact.php?status=thanks");
exit;
}
}
?>