<?php
// Contact subject
$subject = $_REQUEST['subject'];

// Details
$message = $_REQUEST['detail'];

// From
$header="from: ".$_REQUEST['name']." <".$_REQUEST['customer_mail'].">";

// Enter your email address
$to ='[email protected]';

$send_contact = mail($to, $subject, $message, $header);

// Check, if message sent to your email
if($send_contact){
    echo "We've received your contact information";
}
else {
    echo "ERROR";
}
?>