Date: Wed, 16 Sep 2009 10:08:59 -0400 From: Steve Bertrand <steve@ibctech.ca> To: Matthew Seaman <m.seaman@infracaninophile.co.uk> Cc: "questions@freebsd.org" <questions@freebsd.org> Subject: Re: New mail server setup Message-ID: <4AB0F17B.1030400@ibctech.ca> In-Reply-To: <4AB0ECE8.2080905@infracaninophile.co.uk> References: <4AB0584D.3050206@eagle.ca> <4AB0844B.5080804@infracaninophile.co.uk> <4AB0E97B.4060606@ibctech.ca> <4AB0ECE8.2080905@infracaninophile.co.uk>
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This is a cryptographically signed message in MIME format. --------------ms060706010403010800020109 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Matthew Seaman wrote: > Steve Bertrand wrote: > >> If anyone has a setup that has redundancy for their IMAP/POP services, >> and a method to keep the changing data relatively up-to-date, I'd love >> to hear about it. > > Now, that is a different kettle of fish. This is a job for cyrus imap. > I suggest googling for 'cyrus murder' -- this is almost, but not quite, > a fully resilient mail store / IMAP system. Your mail store is divided > into frontend IMAP protocol servers which handle user auth etc. and back-end > mail stores. The protocol layer servers are fully resilient and you can > fail over a user session at will, but the mailstores don't quite get there: > mail is replicated across different stores, but actions modifying the mail > store are not transactional across all the mail stores. Or in other words, > you can lose a small amount of data if one of the mail stores goes bang at > precisely the wrong moment. Even so, it will do better at keeping multiple > copies of a mailstore in synch than any locally scripted rsync setup. This is *EXACTLY* what I was looking for! The possibility of loosing an extremely small amount of data far outweighs the possibility of a multi-hour outage where 3,000 users are receiving "can't reach the POP3 server" errors. Besides, our incoming SMTP gateway boxes cache all incoming email for 24 hours, and we can re-deliver any message to the back-end we wish during that window. I really try my best to design/implement all the systems I can like our networks... multiple paths and extremely quick convergence. Being able to take a box down to test/perform an upgrade, or during a failure without client impact is well worth any initial large learning curve imho. 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