Set up a straight postfix with relay blocking on a server using maildir. Set up whatever tool you want for pop or imap.
That way you get the emails and if you don't care about space, etc. And it uses very little processing power and is pretty much writing direct to disk the moment the emails come in.
That way you get the emails and if you don't care about space, etc. And it uses very little processing power and is pretty much writing direct to disk the moment the emails come in.