PHP mejl script, webbläsaren laddar ner script

<?php
    ini_set("SMTP", "mailout.one.com");
    ini_set("sendmail_from", "example@mail.se");

$to = "example@mail.se";
$subject = "Nytt meddelande";
$name = $_POST['name'];
$message = $_POST['message'];
$phone = $_POST['phone'];
$message = $message;


$headers  = "MIME-Version: 1.0\r\n";
$headers .= "Content-type: text/html; charset=utf-8\r\n";
$headers .= "Content-Transfer-Encoding: 8bit\r\n";
$headers .= "From: $name\r\nReply-To: $name\r\nReturn-Path: $name\r\n";


if (mail ($to, $subject, $message, $headers))

header('Location: ../index.html');

else
 echo "Error 404.";

?>