contact.php

<?php

if(isset($_POST['name'])&&isset($_POST['email'])&&isset($_POST['message'])){
    $name = $_POST["name"];
    $email = $_POST["email"];
    $message = $_POST["message"];
    $to = "youremail@email.com";
    $subject = "Message From $name";
    $headers = "From: $name ".$email;

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

}else{
    echo 'Error';
}