code: def get_subscribers(cls, active_only=True):
          
          subscribers_raw = Subscription.get_for_message_cls(cls.alias)
          subscribers = []
  
          for subscriber in subscribers_raw:
              messenger_cls = subscriber.messenger_cls
              address = subscriber.address
              recipient = subscriber.recipient
  
              # Do not send messages to inactive users.
              if active_only and recipient:
                  if not getattr(recipient, 'is_active', False):
                      continue
  
              if address is None:
                  try:
                      address = get_registered_messenger_object(messenger_cls).get_address(recipient)
                  except UnknownMessengerError:
                      pass
  
              if address and isinstance(address, string_types):
                  subscribers.append(Recipient(messenger_cls, recipient, address))
  
          return subscribers
docs: Returns a list of Recipient objects subscribed for this message type.
  
          :param bool active_only: Flag whether
          :return: