Have you considered GrapheneOS? Not an open source phone as you say, but it is at least open source software, running on hardware with published specs. It should be capable of everything you want.

If anyone says anything is “a surefire way to make money”, they are looking for a Greater Fool on which to unload their position so they can actually make the money.

Has anyone here used Mox? It looks interesting, but maybe a little immature.

I have been using modoboa, my installation is fine as far as it goes, but coming up a little short technologically these days, and the upgrade path is total replace. If you have or install Docker on your server, there are poste.io and docker-mailsever,which both look good. Running your mailserver in a container or VM is almost essential, for security, and so you can blow it away and start over if you make a mistake.

Running an email server is not necessarily hard, but it is stressful: if you have other users, even family, they will take it for granted when it works, and complain loudly when it does not. Like any server that others use. But, beyond security, I have a certain stubborn geek machismo about it, it’s a level of sysadmin above basic.

I honestly can’t understand why most of the popular social media providers are popular. But, if that’s what it takes, could we not?

1. Control and privacy. The server does exactly what I choose, not somebody’s business model.
2. Once you have other users, it’s not a hobby anymore. People are not amused by downtime.
3. The w3schools.com tutorials have been good for me.

1. Musk pledges enormous amount to Trump
2. TSLA drops 10% immediately
3. “I don’t subscribe to the cult of personality” No, you subscribe to the cult of money.