Source code for submit mail with PHP

mail.php

<?php
        // Variables
        $to = $_REQUEST['to'];
        $message = $_REQUEST['message'];
        $subject = $_REQUEST['subjet'];
        $from = $_REQUEST['from'];
        
        // Headers
        $headers = "From: ".$from."\r\n";
        $headers .= "Content-type: text/plain; charset=utf-8\r\n";
        $headers .= "MIME-Version: 1.0\r\n";
        $headers .= "Content-Type: text/html; charset=UTF-8\r\n";
        $headers .= "X-Priority: 1\r\n";
?>