So, I’ve had it up to here (^^^) with the family using WhatsApp, etc and I’m heading off into the land of XMPP to find a better solution.

I’ve got a Pi3 hanging off my pfSense firewall acting as a kinda DMZ box, so thought I could setup an XMPP server on it (Prosody?)

Any advice? Will the Pi crumble (see what I did there) under the pressure of 4 people using it?

Issues with proxying outside with a Lets Encrypt cert on the pfSense box, but maybe not inside the network?

“Better” server software?

Thanks