During Iran's Internet blackout, I set up a chatmail server on an interanet VPS, installed Delta Chat's client (https://delta.chat) on every family member's phone, and they are using it even now after the Internet is back.
I have tried Matrix, XMPP (Conversations), Signal and even some Nostr clients but Delta Chat has by far the best UX and reliability. It has groups, channels and private messages, stickers and built-in video calls. My only gripe is that it doesn't have video messages or screen share like Telegram yet.
If you want to try it out you're always welcome to message me.
I have tried Matrix, XMPP (Conversations), Signal and even some Nostr clients but Delta Chat has by far the best UX and reliability. It has groups, channels and private messages, stickers and built-in video calls. My only gripe is that it doesn't have video messages or screen share like Telegram yet.
If you want to try it out you're always welcome to message me.