Running your own mail server is like learning to ride a bike. Once you're 30 you don't do it anymore unless it's a hobby or you're training for something else 
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This was mostly a joke, in that I do both of the things mentioned in the post. ;)
Thanks. Twitter will use this to make your timeline better. UndoUndo
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There are (IMO) legitimate motivations for running one's own mail server. Convenience, reliability and peace of mind are not among them :)
I personally just want to help preserve the open web - even considering moving the box back home...