@kissane I'm seeing many suggestions for Tuta. It is the most similar, common alternative. But there may be no easy way out of this because… email.

Because it's email, if we want encryption then the email providers on both ends of the conversation need to speak the same language. Anddd if there's email encryption people have to be aware of (including PGP) someone's probably going to footgun it.

There are workarounds but you probably want to move some of these conversations to encrypted texts.