dovecot - Nov 2021 - Bug report: Global Mailbox UID mismatch on replication when upgrading from 2.3.13 to 2.3.17

Hi.

We use dovecot for replication on two dovecot nodes (using Maildir). 
Worked perfectly until upgrading from 2.3.13 to 2.3.17. I found out 
about it a couple of days after where Queued 'full resync' requests had 
gone up. ANd then i saw some failed requests. But nothing in the log. I 
found out which users having trouble and saw that it was new user so i 
ran doveadm sync manually and got the following error:

doveadm(2849817): Warning: Mailbox changes caused a desync. You may want 
to run dsync again: Remote lost mailbox GUID 
38e69e0ba98d936142ac29004e3fea09 (maybe it was just deleted?)

So i found out that dovecot-uidlist had a mismatch on the Global Mailbox 
UID, so global mailbox uid is not the same on both servers. I don't know 
if there is something that has changed with regards to how this GUID is 
generated, because when i look at old mailboxes they are always 
identical on both servers.

I fix this issue manually by editing dovecot-uidlist on one of the 
servers making the global mailbox uid on both servers identical, and 
then run force-resync. This works, but i guess something has changed.



-- 

Dennis H?jgaard
Powerhosting Support

*t:*  +45 7222 4457 |*e:*  dh at powerhosting.dk  |*w:*  https://powerhosting.dk
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