Kirby Custom Mailgun Email Service

MailgunEmailService.php

<?php

// Put this file in the Plugins folder

email::$services['mailgun'] = function($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/v3/' . $email->options['domain'] . '/messages';
  //$auth = base64_encode('api:' . $email->options['key']);
  $auth = 'api:' . $email->options['key'];

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

  $data = array(
    'from'       => $email->from,
    'to'         => $email->to,
    'subject'    => $email->subject,
    'text'       => $email->body,
    'h:Reply-To' => $email->replyTo,
  );
  
  if($email->html()) $data['html'] = $email->html;
  
  // This method doesn't work on production servers
  /*
  $email->response = remote::post($url, array(
    'data'    => $data,
    'headers' => $headers,
    'method'  => 'POST',
  ));
  */
  
  $curl = curl_init();

  curl_setopt($curl, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
  curl_setopt($curl, CURLOPT_USERPWD, $auth);
  curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
  curl_setopt($curl, CURLOPT_CUSTOMREQUEST, 'POST');
  curl_setopt($curl, CURLOPT_URL, $url);
  curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
  curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
  
  $result = curl_exec($curl);
  //$json = json_decode($result);
  $info = curl_getinfo($curl);
  curl_close($curl);
  
  // TODO Set the email resonse method
  //$email->response
  
  if($info['http_code'] != 200) {
    throw new Error('The mail could not be sent!');
  }

};

send_email.php

<?php

$email = new Email(array(
  'to'      => 'foo@domain.com',
  'from'    => 'Excited User <mailgun@YOUR_DOMAIN_NAME>',
  //'replyTo' => var@domain.com, // Recommended
  'subject' => 'Hello',
  'body'    => 'Testing some Mailgun awesomness!',
  'service' => 'mailgun',
  'options' => array(
    'domain' => 'YOUR_DOMAIN_NAME',
    'key'    => 'YOUR_API_KEY',
  )
));

if ($email->send()) {
  $success = l('contact.success');
  $requestData = array();
} else {
  $alert = l('contact.error');
  $success = false;
}

For any reason I can't make work the official Kirby CMS Mailgun email service in production servers. This works fine in localhost but in production doesn't works. Maybe is something about my server configuration.

I fix this issue avoiding the use of the remote:post method and making a custom CURL call