Mailcow or Mailu have pretty good setups if you don’t want to do anything too different and don’t need to keep resource usage to a minimum.

Docker is nice for things that have complex installations and I want a very specific implementation that I don’t plan to tweak very much. Otherwise, it’s more hassle than it’s worth. There are lots of networking issues like limited/experimental support for IPv6, and too much is hidden and preconfigured, making it difficult to make adjustments that would otherwise just be a config file change.

So it is good for products like a mail server where you want to use the exact software they use like let’s say postfix + dovecot + roundcube + nginix + acme + MySQL + spam assassin + amavisd, etc. But you want to use an existing reverse proxy and cert it setup, or want to use a different spam filter or database and it becomes a huge hassle.

My Libre, El Potato, works well enough. I use it to run octoprint on Debian Bullseye and the GPIO to turn on/off the printer and with some temperature sensors and to control the fan in the external electronics enclosure I built. But to be fair, it was a lot more trouble to set up than if I could have gotten my hands on a raspberry pi at the time.

Yeah Comcast has been doing it for a while.

Anyone tried out the L009UiGS-RM? Seeing that it could also run my pihole seems like a big advantage. My edgerouter lite is getting old.