I played with @delta and *damn* is it sweet!
It uses my e-mail account as transport, but encrypts using OpenPGP, and feels like IM. Has groups and all.
It's not exactly a @signalapp replacement (yet?): a). it obviously leaks metadata, as it uses e-mail as transport; and b), it uses Autocrypt for key exchange and I have not found a way to *pin* known keys for certain accounts.
But it's interesting! I will keep an eye on it; 
saga shows why we need to move away from walled gardens.
@rysiek If all servers used TLS enforced by DANE would that mitigate most of the metadata leak potential? Except the IPs of both ends, right? Does Matrix or XMPP federate without exposing IP addresses?
