I've just done such a migration last week-end. It was for a small server with only 20 domains and about 100 mailboxes, but the process should scale fairly well.
I do not recall how to do this in postfix, but note that postfix is not a pop3 server, only SMTP.Right, I have UW-imap and ipop3d also.
Like Joe said, if you haven't made your definitive choice yet, prefer courier over UW-imap and ipop3d. It's a lot more easier and reliable from my own experience.
I know lots of people swaer by Courier but I've followed it's history and the author, whose name eludes me, has a history of deciding what he things is best in defiance of the IMAP specs. If I wanted that sort of behavior, I'd be running Windows.
Also, courier uses the maildir format, which spews, in my case, thens of thousands of indivdual files onto my hard-drive. Yes, it can work with mbox files as well, but it really wants maildir.
http://www.marlow.dk/?target=postfix http://kirb.insanegenius.net/postfix.html http://www.sweeney.demon.co.uk/pfix_imap_virtual.html
(mostly the first one)
Compared with SIMS, this gives quite a similar, maybe even more readable, setup. All the domain and account data is stored in 3 tables with two (transport and virtual) doing the same job as the SIMS' router and the last one (users) being the account placeholder.
Well, that does sound appealing.
The only drawbacks compared with SIMS are that courierpop3d doesn't implement APOP (but a patch exists if it really matters) and that I haven't yet found an easy way to implement aliases valid for all hosted domains.
Neither of these are particularly important.
If you want more info or some little advice, I'll be pleased to share experience with you.
Careful, I might take you up on that. :)
-- There is no Satan. That's just god when he's drunk.
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