code: func (m *ReceivedMessageImpl) Respond(msg *proto.GossipMessage) {
  	sMsg, err := msg.NoopSign()
  	if err != nil {
  		err = errors.WithStack(err)
  		m.conn.logger.Errorf("Failed creating SignedGossipMessage: %+v", err)
  		return
  	}
  	m.conn.send(sMsg, func(e error) {}, blockingSend)
  }
docs: // Respond sends a msg to the source that sent the ReceivedMessageImpl