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
   
([1]https://dovecot.org/mailman3/archives/list/[email protected]/thread/B3TQFAHCYVVXXEL4Y7KOPKJRWZ5I6X7D/),
   but not yet in the ubuntu 26.04 release?

References

   Visible links
   1. 
https://dovecot.org/mailman3/archives/list/[email protected]/thread/B3TQFAHCYVVXXEL4Y7KOPKJRWZ5I6X7D/
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