Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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IMHO a RasPi is just not reliable enough. Your internet connection is just not reliable enough. You are going to lose some of your incoming mail and NOT notice it, unless you have somebody who hosts a secondary MX for your domain.
Chances are also that it's not powerful enough when some of these automated attacks come knocking.
If you know how to set it up, RPI can be reliable enough
Even, IMAP is TCP already, any coming mail should be cached by the router until delivered, and your router usually doesn't loose connection as often as the connected devices