dsync does not like sieve

Hi,

I’m using Dovecot for many years. My installation is configured to manage
spam using sieve. In the same time, I have a backup server, connecting to
the main server every night in order to backup emails (note that the main
server is not pushing its data, but the backup server is pulling them).
Dovecot v2.4 made me re-write the configuration files, so maybe I missed
something, but since then, I cannot make both these service work in the
same time. With my current configuration, the backup server is terminating
in error with the following logs:

dsync-remote([email protected])<HbkSGoKQG2o8+gEAGKlOPA>: Error:
brain S: Exporting mailbox INBOX failed: Mailbox attribute iteration
failed: Internal error occurred. Refer to server log for more
information. [2026-05-31 03:36:03]

(and there are no more logs anywhere).
Because this message
<https://dovecot.org/mailman3/archives/list/[email protected]/thread/MGCGR6B2HSEKPHS4LTM3JWD3LRECJZLB/#345N463ZJJU7MGEICA352KV6C4C4LUES>
was suggesting there could be a problem with sieve, I tried to modify the
configuration. And indeed, when changing sieve configuration, the backup is
working again. But then, my spam filter isn’t anymore.

Here are the relevant parts of the configuration for managing sieve. Can
someone help me saying what could be wrong?

protocols {
  sieve = yes
  imap = yes
  lmtp = yes
}
sieve_extensions {
  fileinto = yes
  reject = yes
  envelope = yes
  encoded-character = yes
  vacation = yes
  subaddress = yes
  comparator-i;ascii-numeric = yes
  relational = yes
  regex = yes
  imap4flags = yes
  copy = yes
  include = yes
  body = yes
  variables = yes
  enotify = yes
  environment = yes
  mailbox = yes
  date = yes
  index = yes
  ihave = yes
  duplicate = yes
  mime = yes
  foreverypart = yes
  extracttext = yes
  vnd.dovecot.pipe = yes
  vnd.dovecot.environment = yes
}
sieve_pipe_bin_dir = /etc/dovecot/sieve
sieve_pipe_socket_dir = sieve-pipe
sieve_plugins {
  sieve_imapsieve = yes
  sieve_extprograms = yes
}
service managesieve-login {
  inet_listener sieve {
    port = 4190
  }
}
sieve_script personal {
}
sieve_script default {
  path = /etc/dovecot/sieve/spam.sieve
}
protocol imap {
  mail_plugins {
    acl = yes
    quota = yes
    imap_acl = yes
    imap_quota = yes
    imap_sieve = yes
  }
}
protocol lmtp {
  mail_plugins {
    acl = yes
    quota = yes
    sieve = yes
  }
}
namespace user {
  inbox = yes
  prefix =
  separator = /
  type = private
  mailbox * {
    sieve_script reportspam {
      cause = flag
      path = /etc/dovecot/sieve/report-spam.sieve
      type = before
    }
  }
}


Thank you.

Stéphane


-- 
Bien cordialement, / Plej kore,

Stéphane Veyret

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