There is an update to AndroidYggmail experiment, someone has rebuilt it: GitHub - JB-SelfCompany/Tyr: True P2P Email on top of Yggdrasil Network
Tyr is available from IzzyOnDroid repository, can be easily installed with Droid-ify:
Some comments on HN: True P2P Email on Top of Yggdrasil Network | Hacker News
Have tried it, it works, but is not fast.
And it seems addresses are discoverable by the network, so got this message a day later:
This problem of receiving unexpected unencrypted messages will be solved with Add option to process unencrypted messages · Issue #7494 · chatmail/core · GitHub, we want to default to ignoring unencrypted messages by default, then such spamming will not be possible.