mailcode

<?php
if(isset($_POST['email'])) {
$email_to = "myemail@mydomain.dk";
$email_subject = "Itesso ELS kontaktform";

function died($error) {
    // your error code can go here
    echo "Beklager, men der er et problem med de felter du har udfyldt.";
    echo "Du kan se fejlene markeret nedenfor.<br /><br />";
    echo $error."<br /><br />";
    echo "Venligst ret og prøv igen.<br /><br />";
    die();
}

// validation expected data exists
if(!isset($_POST['first_name']) ||
    !isset($_POST['last_name']) ||
    !isset($_POST['email']) ||
    !isset($_POST['telephone']) ||
    !isset($_POST['comments'])) {

    died('Beklager, men der er et problem med de felter du har udfyldt.');
}

$first_name = $_POST['first_name']; // required
$last_name = $_POST['last_name']; // required
$email_from = $_POST['email']; // required
$telephone = $_POST['telephone']; // not required
$comments = $_POST['comments']; // required

$error_message = "";
$email_exp = '/^[A-Za-z0-9._%-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$/';

if(!preg_match($email_exp,$email_from)) {
$error_message .= 'Du har indtastet en ugyldig e-mail.<br />';
}

$string_exp = "/^[A-Za-z .'-]+$/";

if(!preg_match($string_exp,$first_name)) {
$error_message .= 'Du har indtastet et ugyldigt fornavn.<br />';
}

if(!preg_match($string_exp,$last_name)) {
$error_message .= 'Du har indtastet et ugyldigt efternavn.<br />';
}

if(strlen($comments) < 2) {
$error_message .= 'Du har indtastet en ugyldig kommentar.<br />';
}

if(strlen($error_message) > 0) {
died($error_message);
}

$email_message = "Detaljer nedenfor.\n\n";

  function clean_string($string) {
  $bad = array("content-type","bcc:","to:","cc:","href");
  return str_replace($bad,"",$string);
  }

$email_message .= "First Name: ".clean_string($first_name)."\n";
$email_message .= "Last Name: ".clean_string($last_name)."\n";
$email_message .= "Email: ".clean_string($email_from)."\n";
$email_message .= "Telephone: ".clean_string($telephone)."\n";
$email_message .= "Comments: ".clean_string($comments)."\n";

// create email headers

$headers = 'From: '.$email_from."\r\n".
'Reply-To: '.$email_from."\r\n" .
'X-Mailer: PHP/' . phpversion();

$mail = mail($email_to, $email_subject, $email_message, $headers);

if($mail) {
echo "Your Mail has been sent!";
} else {
echo "Something went wrong with sending your Mail.";
}

} // If closing
?>