They are not requesting for info on running their own SMTP service that interacts with the greater internet.

Though even if they were, the difficulty is overstated. I’ve run my own for years.

What modern os can be used without any accounts? TempleOS?

Condescending and a pity party. Really a wonder why people aren’t flocking to upvote.

Yeah I got one for free because a family member saw rust and wanted to throw it out.

Scrub, oil, and we’re good to go.

And if you dont have ECC zfs just might save your bacon when a more basic fs would allow corruption

It’s not hard on Debian

https://wiki.debian.org/ZFS