HIGHESTMODSEQ replication issue

[Gustavo Ajeitos [Office365]]

Hello again,

     Any help with this will be very appreciated.

Thank you in advance.
Gustavo Ajeitos

El 9/10/20 a las 16:17, Gustavo Ajeitos escribió:
> Hello,
>
> I'm using dovecot 2.3.10 in OpenSUSE and I have configured a 
> master/master replication between two backends, it works well but I 
> have found an issue with the replication of the HIGHESTMODSEQ.
> When I move a set of message from a mailbox to other, e.g. move 3 
> messages from INBOX to Junk, the HIGHESTMODSEQ get different on each 
> server, with no errors in the log:
>
> [Borrador] 34:34
> [Sent] 63:63
> [Drafts] 12:12
> [Trash] 146:146
> [Junk] 219:218
> [INBOX] 1133:1130
>
> It can be fixed executing a full sync:
> $ sudo doveadm -D -v sync -u user at test.priv -d -l 30 -U
>
> But it is not a solution because it happens all the time that a user 
> move messages.
>
> I'm using ActiveSync and the ActiveSync server use the HIGHESTMODSEQ 
> as part of the synchronization key (sync_key), so in that situation 
> the server detect changes on the mailbox if it connects to the backend 
> with a different HIGHESTMODSEQ that it previously cached, causing a 
> loop beetween the ActiveSync server and the the email client, where 
> the server constantly inform email client about nonexistent changes.
>
> Could it be a bug in Dovecot replication? How can I solve it?
>
> Best regards,
> Gustavo Ajeitos
>