Send mail notification if user subscribes to sendy

<?php
    //------------------- Edit here --------------------//
    $sendy_url = 'http://your.sendy.installation';
    $list = $_POST['list'];
    //------------------ /Edit here --------------------//

    //--------------------------------------------------//
    //POST variables
    $name = $_POST['name'];
    $email = $_POST['email'];
//url2 is used not let spammers subscribe by putting a hidden field in the form.
    $url2 = $_POST['url2'];
//put here any other custom fields you have in the same way as url2 or email or name. Make sure the name in the [''] matches the id of the input field from the html and js file

      //subscribe, put here all the other custom fields. I didn't put url2 because it's only used in this php to check if it's filled
    $postdata = http_build_query(
        array(
        'name' => $name,
        'email' => $email,
        'list' => $list,
        'boolean' => 'true'
        )
    );
    $opts = array('http' => array('method'  => 'POST', 'header'  => 'Content-type: application/x-www-form-urlencoded', 'content' => $postdata));
    $context  = stream_context_create($opts);
    $result = file_get_contents($sendy_url.'/subscribe', false, $context);

//if url2 is completed, don't subscribe (but it gives a success message to the bot (in the .js script)
    if($url2) {
    echo "nu merge";
     }
    else {echo $result;
//you can erase this part if you only want to check for spammers but not send an email notification
    $message = "You have a new subscriber with the following details:\n";


// Send
if($result == "1") {
//you can add more custom fields with the . (dot) function.
mail('[email protected]', 'Subject of the email', $message.$name."\n".$email); }
//erase until here if you don't want to send mail notification
    };

?>