I don’t want to be the “Deputy Downer” here, but I can’t stress the important of the v0 (we say v-naught) plastics in keeping you safe when it comes to electrical installations - for those that aren’t aware, they are plastics that have to self extinguish once the fault trips the electrical protection, should a fault occur that sets them on fire. (ie: once the electricity isn’t making it flame anymore, it has to put itself out)
Here is an example of how even low voltage DC can fault, and had the LED strip diffuser plastic not been v0 rated, we would have had a late night house fire into the roof when kids were asleep…
PETG in this kind of situation just becomes fuel and possible a very, very, very bad day…
I know v0 spools are more expensive, but cheaper than just about any of the disaster situation alternatives, so I always suggest you prototype with PLA/PETG but print v0 for the finals…
IMAP is the protocol you probably want.
I’m quite happy with “Mail In A Box” as a platform for hosting mail locally with clients.
There are companies that will do inbound spam filtering and outbound mail relaying to ensure high reputation for outgoing main also. I have clients on duocircle but they’re grandfathered in on reasonably priced plans (the new plans are probably a little expensive for self hosted home mail)