code: private function configureEmailHelper(ContainerBuilder $container)
      {
          if (!class_exists('Swift_Mailer')) {
              $definition = $container->getDefinition('orkestra.application.helper.email');
              $definition->setClass('Orkestra\Bundle\ApplicationBundle\Helper\EmailHelper\MisconfiguredEmailHelper');
              $definition->setArguments(array());
          }
      }
docs: Configures the EmailHelper
  
  @param ContainerBuilder $container