Patrick - South Valley Internet spake the following on 8/27/2007 3:59 PM:

Hi all,

I posted this question in the Postfix users mailing list as well - I'm not sure if this is Dovecot or Postfix related.

Our old system which we migrated off of was an AIX 5.2 machine running most recent Postfix and mbox format with UW-IMAP. We've migrated to most recent Postfix, using Maildir and Dovecot v1.

After we used mb2md to migrate over all our customers, some of our customers have called in to let us know they are receiving duplicate e-mails. It's not happening to everyone, it's random (well, I'm sure it's not really random, I haven't found the issue yet).

I don't even know where to start. I looked at the logs, but everything looks fine.

How can I troubleshoot something like this? Have any of you experienced the same issue?

Thanks in advance.

The Pop3-UIDL format was different between UW-Imap and your new install of dovecot. The users should only get duplicates once, and then it should stabilize. I don't think you can easily fix it now, because if you correct the UIDL the users that already got duplicates will get them again, and if you leave it , the remaining users might get the duplicates. It should only affect your pop3 users that leave mail on the server. Your IMAp users, if you have any might see some effect, but it will just be their listings expiring and refreshing.

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