PHP mail script not sending mails [closed]

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I found a PHP script online that isn't working for me while it's nearly identical to others that do work. I just can't seem to get it fixed, here's the one that does work: http://pastebin.com/L1YQ20qf

Also I censored the email and tested it on a PHP supporting webhost, so that can't be the issue. Anyone?

    <?php
if($_POST)
{
    //check if its an ajax request, exit if not
    if(!isset($_SERVER['HTTP_X_REQUESTED_WITH']) AND strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) != 'xmlhttprequest') {
        die();
    }

    $to_Email       = "censored@myemail.com"; //Replace with recipient email address
    $subject        = 'Contactformulier'; //Subject line for emails

    //check $_POST vars are set, exit if any missing
    if(!isset($_POST["userName"]) || !isset($_POST["userEmail"]) || !isset($_POST["userPhone"]) || !isset($_POST["userMessage"]))
    {
        die();
    }

    //Sanitize input data using PHP filter_var().
    $user_Name        = filter_var($_POST["userName"], FILTER_SANITIZE_STRING);
    $user_Email       = filter_var($_POST["userEmail"], FILTER_SANITIZE_EMAIL);
    $user_Phone       = filter_var($_POST["userPhone"], FILTER_SANITIZE_STRING);
    $user_Message     = filter_var($_POST["userMessage"], FILTER_SANITIZE_STRING);

    //additional php validation
    if(strlen($user_Name)<4) // If length is less than 4 it will throw an HTTP error.
    {
        header('HTTP/1.1 500 Naam te kort.');
        exit();
    }
    if(!filter_var($user_Email, FILTER_VALIDATE_EMAIL)) //email validation
    {
        header('HTTP/1.1 500 Controleer email adres.');
        exit();
    }
    if(!is_numeric($user_Phone)) //check entered data is numbers
    {
        header('HTTP/1.1 500 Alleen nummers als telefoonnummer.');
        exit();
    }
    if(strlen($user_Message)<5) //check emtpy message
    {
        header('HTTP/1.1 500 Bericht te kort.');
        exit();
    }

    //proceed with PHP email.
    $headers = 'From: '.$user_Email.'' . "rn" .
    'Reply-To: '.$user_Email.'' . "rn" .
    'X-Mailer: PHP/' . phpversion();

    @$sentMail = mail($to_Email, $subject, $user_Message .'  -'.$user_Name, $headers);

    if(!$sentMail)
    {
        header('HTTP/1.1 500 Kon het bericht niet verzenden, onze excuses!');
        exit();
    }else{
        echo 'Bericht verzonden!';
    }
}
?>

Answer 1

YOU SHOULD NOT BE USING THE MAIL() FUNCTION

It is very hard to comply with email format RFCs manually using mail(). Instead, update your code to use PHPMailer or a similar library.

Your additional headers variable is incorrect - you must have a Content-type and MIME-Version header:

//proceed with PHP email.
$headers = "From: $user_Email\n" .
"Reply-To: $user_Email\n" .
"MIME-Version: 1.0\n" .
"Content-Type: text/html\n" .
"X-Mailer: PHP/" . phpversion();

$sentMail = @mail($to_Email, $subject, $user_Message .'  -'.$user_Name, $headers);