Formulario email.php Ayuda

Hola amigo, espero estes bien, mi pregunta es la siguiente tengo un formulario email.php y lo tengo en http://www.servicecrtour.com/index-4.html el cual esta vinculado a el formulario email.php ,  cuando los clientes envian informacion, este llega sin nada dentro, solo llega,
Nombre
Apellido
E-mail
Telefono
Mensaje
pero todo sin informacion, por favor nesecito saber en que estoy fallando o si falta algo de codigo, por favor ayuda, gracias de antemano.
subi un documento web en formato pdf por si acaso no se ve la informacion como le sucedio a otro usuario que tenia un problema parecido
http://www.servicecrtour.com/formularios/email.pdf
el codigo es
<?php
/***************************************************\
 * PHP 4.1.0+ version of email script. For more
 * information on the mail() function for PHP, see
 * http://www.php.net/manual/en/function.mail.php
\***************************************************/
// First, set up some variables to serve you in
// getting an email.  This includes the email this is
// sent to (yours) and what the subject of this email
// should be.  It's a good idea to choose your own
// subject instead of allowing the user to.  This will
// help prevent spam filters from snatching this email
// out from under your nose when something unusual is put.
$sendTo = "[email protected]";
$subject = "Resivido Desde www.servicecrtour.com";
// variables are sent to this PHP page through
// the POST method.  $_POST is a global associative array
// of variables passed through this method.  From that, we
// can get the values sent to this page from Flash and
// assign them to appropriate variables which can be used
// in the PHP mail() function.
// header information not including sendTo and Subject
// these all go in one variable.  First, include From:
$headers = "From: " . $_POST["name"] ." ". $_POST["lastname"] . "<" . $_POST["email"] .">\r\n";
// next include a replyto
$headers .= "Reply-To: " . $_POST["email"] . "\r\n";
// often email servers won't allow emails to be sent to
// domains other than their own.  The return path here will
// often lift that restriction so, for instance, you could send
// email to a hotmail account. (hosting provider settings may vary)
// technically bounced email is supposed to go to the return-path email
$headers .= "Return-path: " . $_POST["email"];
// now we can add the content of the message to a body variable
    $message .=  "==================================" . "\n";
    $message .=  " Servicecrtour" . "\n";
    $message .=  "==================================" . "\n" . "\n";
    $message .= "Nombre: " . $HTTP_POST_VARS["nombre"] . "\n" . "\n";
    $message .= "Apellido: " . $HTTP_POST_VARS["apellido"] . "\n" . "\n";
    $message .= "Telefono: " . $HTTP_POST_VARS["telefono"] . "\n" . "\n";    
    $message .= "E-mail: " . $HTTP_POST_VARS["email"] . "\n" . "\n";
    $message .= "Mensaje: " . $HTTP_POST_VARS["mensaje"] . "\n" . "\n";
    $mensaje.= $_POST['mensaje']."\n\n";
// once the variables have been defined, they can be included
// in the mail function call which will send you an email
mail($sendTo, $subject, $message, $headers);
?>
<script type="text/javascript">
    var pagina = 'gracias.html';
    var segundos = 0;
    function redireccion() {
        document.location.href=pagina;
    }
    setTimeout("redireccion()",segundos);
</script>