Frontend\Modules\Mailmotor\EventListener\SubscribeFromFormBuilderSubmittedForm::onFormBuilderSubmittedEvent PHP Method

    public function onFormBuilderSubmittedEvent(FormBuilderSubmittedEvent $event)
    {
        if ($this->modulesSettings->get('Mailmotor', 'automatically_subscribe_from_form_builder_submitted_form', false)) {
            $form = $event->getForm();
            $data = $event->getData();
            $email = null;
            // Check if we have a replyTo email set
            foreach ($form['fields'] as $field) {
                if (array_key_exists('reply_to', $field['settings']) && $field['settings']['reply_to'] === true) {
                    $email = unserialize($data[$field['id']]['value']);
                }
            }
            // Define language
            $language = array_key_exists('language', $form) ? $form['language'] : $this->modulesSettings->get('Core', 'default_language', 'en');
            // We subscribe the replyTo email
            try {
                // Does email exists or not in our mailing list
                $exists = (bool) $this->subscriber->exists($email);
                // We only need to subscribe when not exists
                if (!$exists) {
                    $this->subscriber->subscribe($email, $language, array(), array(), false);
                }
            } catch (NotImplementedException $e) {
                // We do nothing as fallback when no mail-engine is chosen in the Backend
            }
        }
    }