#chatmail does secure email federation that works. Using lean "relay" servers that enforce metadata-minimized end-to-end encryption.
There is a new little tool that checks whether two relays are interacting well for messaging, and how fast. You need a terminal window and be able to execute:
pip install cmping
you can then run for example:
cmping mailchat.pl nine.testrun.org
to perform a "ping" test for e2ee-messaging. Also see https://chatmail.at/relays
