My documentation problem was largely fixed by using Nixos. The actual OS instances are self-documenting that way.
As far as the documentation for the network setup itself goes, a simple wiki does the rest of the trick for me.
All you need is a local smtp server that relays to another, “real” smtp server. I have a postfix that is configured to use the Proton smtp servers (before that it was Googles). No issues on Telenet.
My documentation problem was largely fixed by using Nixos. The actual OS instances are self-documenting that way.
As far as the documentation for the network setup itself goes, a simple wiki does the rest of the trick for me.