Here's some more debugging info in case this helps:

Feb 15 18:33:44 dsync(u...@domain.tld): Debug: Mailbox INBOX: Mailbox opened
Feb 15 18:33:44 dsync(u...@domain.tld): Debug: brain S: Syncing mailbox 77727820079bdd584f280000773ea8bd: UIDNEXT changed: 1 -> 12170 Feb 15 18:33:44 dsync(u...@domain.tld): Debug: brain M: Syncing mailbox 77727820079bdd584f280000773ea8bd: UIDNEXT changed: 12170 -> 1 Feb 15 18:33:44 dsync(u...@domain.tld): Debug: doveadm-sieve: Iterating Sieve mailbox attributes Feb 15 18:33:44 dsync(u...@domain.tld): Debug: sieve: Pigeonhole version 2.4.0 (1b2d5bb9) initializing Feb 15 18:33:44 dsync(u...@domain.tld): Debug: Loading modules from directory: /usr/lib64/dovecot/sieve Feb 15 18:33:44 dsync(u...@domain.tld): Debug: Module loaded: /usr/lib64/dovecot/sieve/lib90_sieve_imapsieve_plugin.so Feb 15 18:33:44 dsync(u...@domain.tld): Debug: sieve: Sieve imapsieve plugin for Pigeonhole version 2.4.0 (1b2d5bb9) loaded Feb 15 18:33:44 dsync(u...@domain.tld): Error: brain M: Exporting mailbox INBOX failed: Mailbox attribute iteration failed: Mailbox attributes not enabled Feb 15 18:33:44 dsync(u...@domain.tld): Debug: brain S: Import mailbox INBOX: Saved UIDs:
Feb 15 18:33:44 dsync(u...@domain.tld): Debug: User session is finished
Feb 15 18:33:44 dsync(u...@domain.tld): Debug: auth-master: conn unix:/run/dovecot/auth-userdb (pid=56369,uid=0): Disconnected: Connection closed (fd=9)

On 2/14/2025 7:06 PM, Asai via dovecot 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

So, I tried to set the configs to include:

protocol imap {
  imap_metadata = yes
  ...
}

mail_attribute {
  dict file {
    path = %{home}/dovecot-attributes
  }
}

But then I get:

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

Can anyone clarify the proper configs for this?

Thank you,

Asai

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