/**
  * Returns the list of attribute names of the model.
  * @return array list of attribute names.
  */
 public function attributes()
 {
     return array_merge_recursive(parent::attributes(), ['email', 'tags', 'url', 'properties', 'does_email_exist']);
 }
 /**
  * Returns the list of attribute names of the model.
  * @return array list of attribute names.
  */
 public function attributes()
 {
     return array_merge_recursive(parent::attributes(), ['markup', 'name']);
 }
 /**
  * Returns the list of attribute names of the model.
  * @return array list of attribute names.
  */
 public function attributes()
 {
     return array_merge_recursive(parent::attributes(), ['status', 'tags', 'tags_union', 'tags_and_receivers_union', 'unsubscribe_tags', 'url', 'subscribers', 'layout_id', 'context', 'attachments']);
 }
 /**
  * Returns the list of attribute names of the model.
  * @return array list of attribute names.
  */
 public function attributes()
 {
     return array_merge_recursive(parent::attributes(), ['markup', 'name', 'plaintext_markup', 'subject_markup', 'base']);
 }