https://delta.chat/
https://delta.chat/en/help#e2ee
I gave it another try last week
It's still in development, it's not a fully fledged replacement for Matrix yet, but I could see it replace Signal at some point.
For a list of servers: https://chatmail.at/relays
They solved that by now using Delta-chat dedicated email servers (called chatmail servers): https://delta.chat/en/2023-12-13-chatmail
Definitely much better that what it used to be, I had a similar experience to you a few years ago.
Icon base by Lorc under CC BY 3.0 with modifications to add a gradient
They solved that by now using Delta-chat dedicated email servers (called chatmail servers): https://delta.chat/en/2023-12-13-chatmail
Definitely much better that what it used to be, I had a similar experience to you a few years ago.