OT: I'm curious as to why you're migrating from Postfix to Qmail.

Thanks I will have a look.

To answer your question, we've several high volume production servers running Qmail and one small server running Postfix. We are migrating not because Postfix doesn't work well, but because we want to maintain one system and the ratio of domains on our qmail servers (heavily patched) is thousands to one. And secondly (not important), our inhouse expertise is limited to qmail. (not postfix).

Sincerely,

• Wouter van der Schagt

On Nov 28, 2008, at 4:54 PM, Wouter van der Schagt wrote:

...

Please look at http://wiki.dovecot.org/Migration/MailFormat

There's a modified version of mb2md.pl there that will keep the
existing UIDL info.

I look at it, it does indeed generate the ~/Maildir/dovecot-uidlist
file with the proper values, however my email client still retrieves a 2nd
copy in this test scenario

• Download emails from postfix server
• Migrate to other server
• Download emails from new server (should not happen, due to same
  uidl), but still does

How can i further troubleshoot what the uidl problem is?

Look at the old UIDLs and look at the new UIDLs. How are they different?

My guess is you'll need to set pop3_uidl_format = %v.%u

On Nov 28, 2008, at 5:18 PM, Wouter van der Schagt wrote:

Thank you for the reply, I understand the problem now, however
changing the pop3_uidl_format on the target server is not an option
since it is a high volume production server. It is currently set to
%f because of a previous migration from qmail-pop3d.

I don't suppose the pop3_uidl_format setting can be configured on a
per popbox basis?

With v1.1 you can add POP3 UIDLs fo dovecot-uidlist. For example if
you have mailbox with UIDVALIDITY 1234 and then entries:

123 :file1 124 :file2

You can add their %v.%u UIDL:

123 P1234.123 :file1 124 P1234.124 :file2

i.e. P followed by the UIDL.

On Sat, 2008-11-29 at 00:15 +0800, Wouter van der Schagt wrote:

...

With v1.1 you can add POP3 UIDLs fo dovecot-uidlist. For example if you have mailbox with UIDVALIDITY 1234 and then entries: You can add their %v.%u UIDL: 123 P1234.123 :file1 124 P1234.124 :file2

...

i.e. P followed by the UIDL.

That sounds good, however, when i have the following dovecot-uidlist file...

1 1146473021 25449 25360 P1146473021.25360 :1227888318.000000.mbox,S=37351:2,

This mixes v3 syntax with v1 syntax, won't work.

3 V1146473021 N25627 1146473021 25449

This is more like what the header should look like, except for the extra two fields.

IE: the header is different, if the first is the version number, where can i find more information on the syntax to use in v3?

I'm not sure if I've documented it anywhere. Anyway, the header is simple:

3 Vuidvalidity Nnext-uid

Where uidvalidity and next-uid are exactly the same as in v1 (1 uidvalidity next-uid). The records are as you tried to use them originally.