On Nov 28, 2008, at 6:43 PM, Wouter van der Schagt wrote:

...

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

You're right, after changing it to the v3 syntax i'm getting exactly
the same output in both servers after issuing the UIDL command in a
telnet session. So far so good.

However, a 2nd copy of the files is still being downloaded. Is this
because the IP has changed? My steps are.

• Download emails from IP.IP.IP.1
• Migrate emails
• Confirm manually that UIDL output is the same
• If so, download emails from IP.IP.IP.2

And in the last step, im still getting a 2nd copy of all emails.
Where is the fault in my reasoning? Do i need to give dovecot a
message number that was last downloaded?

If the UIDLs are exactly the same, I've no idea why the client would
download a duplicate. I haven't heard before that a changed IP would
be an issue. Of course that would still be a client-specific issue.
Sounds a bit unlikely though.

Ccing back to list in case someone else has an idea..