Still run by the same creator that shutdown to stop gov gaining access to encryption keys. Their work on DIME (Dark Internet Mail Environment) looks quite promising and would appear to disagree with your statement.

Was planning on hosting from my home server. Will definitely read up on those protocols and the recommendations. Have certificates and domain routed through Cloudflare. ISP is Optus but it’s not a business connection so that could be problematic r.e: spam filters :/

Sweet thanks. Only other thing I’ve been concerned about is opening ports into my network. Anything you’ve done to increase the security with this in mind?

By VPS I assume you mean I would need to spin up a new Ubuntu VM instead of say run it in docker along with a bunch of other services. Or are you saying I’d need to have a completely separate barebones machine?

I’m currently running OPNsense virtualised in Proxmox. It’s a little confusing if you haven’t run a custom firewall before but the setup was relatively simple and works flawlessly now that I understand it a bit better. The only downside being if you are running it on the same machine as your services need to restart your network will go down as well.