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.


The implementation I made is using a MySQL DB and was heavily inspired by the following lectures (found on the Postfix website) :

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.

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.

If you want more info or some little advice, I'll be pleased to share experience with you.

Antoine.

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