/**
  * Callback function to change a sender handle in each newsletter field.
  *
  * @param string $context
  * @return void
  */
 public function senderSaved($context)
 {
     $old_handle = $context['handle'];
     $new_handle = Lang::createHandle($context['fields']['name'], 255, '-');
     EmailNewsletterManager::updateSenderHandle($old_handle, $new_handle);
 }