[Dovecot] Turning off "Fixed Duplicates" feature

[Timo Sirainen]

On Thu, 2009-11-12 at 16:04 -0800, Jordan Tardif wrote:
> Heres a litle bit of background on what we are doing and maybe if you have 
> time you can let me know what you think the best way of doing this would 
> be. When we move users to dovecot servers, we first create a new user on 
> the destination machine, then do a rsync from the old user (that contains 
> all the courier* files) to the new one, and then run the migration script 
> found in the dovecot wiki to convert the courier* files to dovecot*. 6 
> Hours later we rsync from the old user to the new one again to make sure 
> that any emails that have been delived to the old user while dns updates 
> make it to the new users account. Then we run the migration script again 
> with --overwrite so it creates the new courier* files. Would you also 
> reccomend removing any dovecot.index.cache files at this time as well? Can 
> you think of another way to do this move so that dovecot would not have 
> this problem with duplicates?

When do the imap/pop3 sessions actually start using the new machine?
Does that depend on DNS also? Running migration script multiple times
isn't a good idea. It can change IMAP UIDs and cause trouble with
clients that use a local cache. It could even lose messages since client
doesn't realize that there's a new message with an existing one's UID..

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