Envoie email

<?php
    if(isset($_POST["envoyer"])) {

        $message = "";

        $message .= "Nom : ".$_POST["nom"]. "\r\n";
        $message .= "Mail : ".$_POST["email"]."\r\n";
        $message .= "Message : ".$_POST["message"]."\r\n";

        $headers = "From:  " . $_POST['nom'] . "<".$_POST['email']."> \r\n" .
            "CC:  ". $_POST['email'] ;
        $to = "tonny1618@gmail.com";
        mail($to, $_POST['sujet'], $message, $headers);


    }

    ?>