It’s sad that people are trying to improve things only by fear and not be reason :(

Hello

We are using for years home and business gnupg (for public/private keys) + pass + QtPass + git (for remote central storage). We are using it even as a team with shared keys.

Hello.

Have you tried an FOSS XMPP server solution ?

Just replace your entire Microsoft email server with a self-hosted FOSS Linux email solution, where you can have unlimited email accounts.

Hello.

Hopefully, feedback is appreciated.

Searched on Google Play with no results, same on F Droid.

Thanks.