Kirby + Mailgun HTML Email service

mailgun-html.php

<? email::$services['mailgun-html'] = function($email) {

  if(empty($email->options['key']))    throw new Error('Missing Mailgun API key');
  if(empty($email->options['domain'])) throw new Error('Missing Mailgun API domain');

  $url  = 'https://api.mailgun.net/v2/' . $email->options['domain'] . '/messages';
  $auth = base64_encode('api:' . $email->options['key']);

  $headers = array(
    'Accept: application/json',
    'Authorization: Basic ' . $auth
  );

  $data = array(
    'from'       => $email->from,
    'to'         => $email->to,
    'subject'    => $email->subject,
    'html'       => $email->body,
    'h:Reply-To' => $email->replyTo,
  );

  $email->response = remote::post($url, array(
    'data'    => $data,
    'headers' => $headers
  ));

  if($email->response->code() != 200) {
    throw new Error('The mail could not be sent!');
  }

};