";
        echo $error . "
";
        echo "
";
        die();
    }
    if (
        !isset($_POST['Name']) ||
        !isset($_POST['Message'])
    ) {
        problem('There is a problem with your input:');
    }
    $name = $_POST['Name'];
    $email = 'email@example.de';
    $message = $_POST['Message'];
    $error_message = "";
    $email_exp = '/^[A-Za-z0-9._%-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$/';
    if (!preg_match($email_exp, $email)) {
        $error_message .= 'na .
';
    }
    $string_exp = "/^[A-Za-z .'-]+$/";
    if (!preg_match($string_exp, $name)) {
        $error_message .= 'The registered concern does not seem to be valid!
';
    }
    if (strlen($message) < 2) {
        $error_message .= 'The registered message does not seem to be valid!
';
    }
    if (strlen($error_message) > 0) {
        problem($error_message);
    }
// Formular
    function clean_string($string)
    {
        $bad = array("content-type", "bcc:", "to:", "cc:", "href");
        return str_replace($bad, "", $string);
    }
    $email_message .= "Concerns: " . clean_string($name) . "\n";
    $email_message .= "Message: " . clean_string($message) . "\n";
    // email header
    $headers = 'From: ' . $email . "\r\n" .
        'Reply-To: ' . $email . "\r\n" .
        'X-Mailer: PHP/' . phpversion();
    @mail($email_to, $email_subject, $email_message, $headers);
?>
    Your message has been sent!