Hi Ellie

i think I found the problem:

In in cyrus-imapd-3.4.8/imap/sync_support.c:1485 decode_annotations
the sync server is expecting a MODSEQ for Annotations, but the older version of
cyrus did not send the MODSEQ


It seems this feature was introduced between 3.0 and 3.2

I have created a new Issue to track this
https://github.com/cyrusimap/cyrus-imapd/issues/4967

Kind Regards

   Michael Menge

Quoting ellie timoney <[email protected]>:

Hi Michael,

On Thu, 4 Jul 2024, at 12:15 AM, Michael Menge wrote:
Hi Ellie,

I was able to copy the failed mailbox to our test servers and I am still
able to reproduce the error.

Interesting, so that suggests it's something about that mailbox that's leading to the bad protocol talk. I wonder what?

To me it seams that the failed command in the telemetry does only
contain minimal
sensitive data. If you want I can send the "APPLY MAILBOX" command
directly to you.

Please do, thanks. I'll see if I can figure out what the replica is complaining about, and maybe that will shed some light on the underlying cause.

I will also try to debug it myself, but as we are sill in the process
of migrating form
3.0 to 3.4 it may take some days,

Sure, good luck. :)

Cheers,

ellie

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