If you buy a package, you usually can get a Raspi plus case plus SD card and power supply for below 60€. Also a Raspi only sucks up to a 10W of power. Show me a used netbook / PC which runs at this power consumption. Raspi is defenitly not fully free but has several advantages over a "normal PC".

Setting up a mail server and other typical Linux services under a pure console is equally "hard". Be it a raspi or a x86 PC.

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