dsync between 2.3.16 and 2.4.2

Hi,

I currently have a doveadm backup running my prod and backup server. Both
are currently running 2.3.16, and the following command runs fine:

sudo doveadm -v backup -u XXXX -P remote:[email protected]

I am in the process of updating my servers to ubuntu 26.04 which runs
dovecot 2.4.2 and I am running into problems trying to run this command.

For some reason, it tries to delete the INBOX on the destination and I get
the following error:
dsync-remote(XXXX)<7hkbKDl6F2rlxQAArPp36Q>: Error: brain S: Mailbox INBOX
sync: mailbox_delete failed: The /private/specialuse attribute cannot be
changed
doveadm(228686): Error: Remote command returned error 65: ssh -lXXXX
192.168.111.XX doveadm dsync-server -uXXXX

I am not sure what/why this is happening. I read the docs and man page, but
could not find a solution.

Anyone knows what is happening, and how to solve this?

Thanks,

-JD

----- Addendum -----

Another thing that might help someone else: I had to add a line to the
config file to avoid the -U problem:

dsync_remote_cmd = "ssh -l%{login} %{host} doveadm dsync-server -u%{user}"

This seems to already be solved (
https://dovecot.org/mailman3/archives/list/[email protected]/thread/B3TQFAHCYVVXXEL4Y7KOPKJRWZ5I6X7D/),
but not yet in the ubuntu 26.04 release?

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