Put proxmox on the computer and from there you can deploy a bunch of oses

https://youtu.be/eHxVvqzEtmc?si=BU6TYxt3cxl9yxdW

It's like this

Everything looks good, and wonderful but there's always a surprise waiting for your.

Coming from an exchange engineer with over 11+years experience

Honestly it's fun and all but I wouldn't recommend for anything work related. If I were to run a mail server at home I'd make sure I get a mail gateway you can proxy your mail through that manages blacklists and reputation.

The biggest limitation is connection limits. While 2-3 users won't matter, once you get past 10 connections you will start to get into issues.

I wouldn't recommend powerlone but a mesh should resolve your issue given the signal is good. Is there a coax cable you can tap into?