If you want to try a secure messaging protocol based on tried-and-tested mail + gpg.

My new #deltachat instance is now up at https://vinculum0.net

Powered by Hetzner in Europe.

Admin is nostr:npub18ps93ag0kw4k08umetn56ucaaf5nsarg35cxffgyaa0sl4wdajusewz7hc

Or install your own instance - https://chatmail.at/doc/relay/index.html