@blake

1) Many people want end to end encryption by default and only. Signal has dropped SMS chats three years ago. Mixing cleartext and e2ee is problematic from a usable security pov

2) Several #chatmail operators in repressive situations/environments want to be sure their servers do not contain data that can hurt people. Strictly requiring end to end encryption helps.

3) We use IETF standardized protocols for interoperability and discuss with other MUA devs and help where we can.