dovecot migration

Joseba Torre joseba.torre at
Tue Jan 27 09:06:48 UTC 2015

El 27/01/15 a las 03:54, mkawada at escribió:
> Dear List,
> To migrate a dovecot server from dovecot-1.x to dovecot-2.x, then I
> wonder if the UIDL format "pop3_uidl_format" setting is required in the
> configuration file for clients not to re-download the same mails from
> the migrated mail server. Currently, no UIDL format is set in
> /etc/dovecot file of the one using dovecot-1.x server which means it is
> commented out as default like below.
> ]# grep pop3_uidl_format /etc/dovecot.conf
> #pop3_uidl_format = %08Xu%08Xv <----
> Does this mean the "pop3_uidl_format" is in use as "%08Xu%08Xv" by
> default? I see the same in /etc/dovecot/conf.d/20-imap.conf of the one
> using dovecot-2.x, and have not been able to find any information saying
> it's the defualt setting.
> Here are the questions:
> 1.Can we say the "pop3_uidl_format = %08Xu%08Xv" is the enabled default
> setting? Or any ways to check the default?

You can get the current configuration with

dovecot -a

In order to get only diferences from the defaults, dovecot -n.

> 2.Do they need to specify anything for the "pop3_uidl_format =" field
> for their migration in this case?

Better safe than sorry: get the current value and add the 
pop3_uidl_format line in your conf.
> Env infomation:
> dovecot-1.x
> dovecot-2.x
> mail_location = mbox
> Any information/clues would be greatly appreciated.
> Thanks,

More information about the dovecot mailing list