docs: def recipients(messenger, addresses):
      """Structures recipients data.
  
      :param str|unicode, MessageBase messenger: MessengerBase heir
      :param list[str|unicode]|str|unicode addresses: recipients addresses or Django User
          model heir instances (NOTE: if supported by a messenger)
  
      :return: list of Recipient
      :rtype: list[Recipient]
  
      """
      if isinstance(messenger, six.string_types):
          messenger = get_registered_messenger_object(messenger)
      return messenger._structure_recipients_data(addresses)