Hi Roger,
I'll give an anecdote.
The Raspberry Pi runs a hardware-tweaked version of Linux and I was
surprised at just how well it performs and what's installable from the
repositories. I bought one out of curiosity then, after a machine
failure, put it into my home networks as a DMZ and postfix mail host as
a temporary fix. system, load with "w" was 0 0 0, even with anti-spam
running. Oh; right; let's try anti-virus filtering, too. Still around
0 0 0. Wow. Later I also added a squid proxy ... system load still modest.
It stopped being a temporary fix ... it's still there.
I would suggest they get one and try it for their wanted purposes. I
think they'll be pleasantly surprised at what it can do.
https://tutorials-raspberrypi.de/
https://www.makershop.de/raspberry-pi
https://www.raspberrypi.com
https://thepihut.com/
In a hot climate the standard Pi may well want some heat-sinking. I've
used these cases:
https://thepihut.com/collections/raspberry-pi-cases/products/aluminium-armour-heatsink-case-for-raspberry-pi-4
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