On 15. Feb 2025, at 4.06, Asai via dovecot <dovecot@dovecot.org> wrote:
> 
> Greetings,
> 
> On 2.3 I was able to run the following command, but now on 2.4 I'm getting 
> the following error:
> 
> doveadm backup -u u...@domain.tld maildir:/mnt/backups/daily/domain.tld/user
> 
> dsync(u...@domain.tld): Error: brain M: Exporting mailbox INBOX failed: 
> Mailbox attribute iteration failed: Mailbox attributes not enabled

This is actually wrong error message, which shouldn't have been logged. It's 
been confusing earlier too. I'll fix the code so it no longer writes it. 
Instead, this is more correct..:

> Error: brain M: Exporting mailbox INBOX failed: Mailbox attribute iteration 
> failed: BUG: Unknown internal error

The problem most likely here is that your Sieve settings aren't working for 
some reason. Unfortunately the error handling code paths are buggy in v2.4.0, 
so you're not getting the proper error logged. If you post your doveconf -n 
output I could try to figure it out.

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