code: public void addNewMessageToSend(MessageID messageID, Collection<Address> destinations, long initialSequenceNumber,
                                      boolean deliverToMyself) {
          MessageInfo messageInfo = new MessageInfo(destinations, initialSequenceNumber, deliverToMyself);
          if (deliverToMyself) {
              messageInfo.setProposeReceived(messageID.getAddress());
          }
          sentMessages.put(messageID, messageInfo);
      }
docs: Add a new message sent
  @param messageID             the message ID
  @param destinations          the destination set
  @param initialSequenceNumber the initial sequence number
  @param deliverToMyself       true if *this* member is in destination sent, false otherwise