Re: Why a PC?
From an hardware power perspective, a Pi is perfectly able to handle a moderate mail traffic. The drawbacks are its hardware is not really designed for 24x7 operations, and I would not store my emails on a SD card (especially a consumer grade one), since a mail server writes often - nor on an USB disk )of course, backups are a must anyway).
Then everybody needs to select which hardware he or she can afford, understand how critical mails are, and so on.
Biting the hand that feeds IT
