http://monerotoruzizulg5ttgat2emf4d6fbmiea25detrmmy7erypseyteyd.onion/resources/user-guides/multisig-messaging-system.html
The author of the MMS hopes that you will give it a try: PyBitmessage is fully open source, is under continued development, has enough users to almost assure message transport at any time, and takes privacy very seriously - just like Monero.