Re: Bug report: Pigeonhole Sieve d elivery plugin fails to load in Dov ecot 2.4 — undefined symbol mail_d eliver_ctx_get_log_var_expand_table

On August 7, 2026 2:12:42 AM GMT+03:00, Developer Sub N Grill via dovecot <[email protected]> wrote:
>Hello Dovecot Team,
>
>I am reporting what appears to be a packaging/ABI issue affecting the Pigeonhole Sieve delivery plugin in Dovecot 2.4. I have performed extensive diagnostics and would appreciate any guidance.
>
>Environment
>Operating System: Debian 13 (Trixie), amd64
>Repository: Official Dovecot CE repository (repo.dovecot.org/ce-2.4-latest/debian/trixie)
>Installed package version:2:2.4.4-5+debian13
>Installed packages:
>
>dovecot-core
>dovecot-sieve
>dovecot-lmtpd
>dovecot-imapd
>dovecot-pop3d
>dovecot-managesieved
>dovecot-pgsql
>All packages are installed at the exact same version.
>
>Problem Description
>When enabling the Sieve delivery plugin with:
>
>mail_plugins {
>  sieve = yes
>}
>Dovecot fails to load the plugin with the following error:
>
>sievec: Fatal: Couldn't load required plugin /usr/lib/dovecot/modules/lib90_sieve_plugin.so:
>dlopen() failed: /usr/lib/dovecot/modules/lib90_sieve_plugin.so:
>undefined symbol: mail_deliver_ctx_get_log_var_expand_table
>As a result, message delivery fails entirely whenever the Sieve delivery plugin is enabled. Disabling the plugin restores normal mail delivery.
>
Can't reproduce this. Sieve works and sorts mail coming in via lmtp.

Also on debian 13 with the dovecot ce packages.

For LMTP my 20-lmtp.conf has this section. If you use LDA you will have to load the plugins for protocol lda as well.

protocol lmtp {
  mail_plugins {
    sieve = yes
    quota = yes
    fts = yes
    fts_solr = yes
  }
}

>Thank you for your time. I would be happy to provide additional logs, the complete doveconf -n output, or a core dump if that would be helpful.

doveconf -n would be very useful to start with.

>
>Best regards,
>
>Miguel A Morales
>
>Server: Debian 13 (amd64)
>Dovecot: 2.4.4-5+debian13

-- 
Christian Kivalo
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