How can I fix the error: doveconf: Fatal: Error in configuration file /etc/dovecot/conf.d/99-warden.conf line 9: Unknown section name: plugin after upgrading to Plesk 18.0.73?

After upgrading to Plesk 18.0.73 dovecot refuses to start. This is because Plesk upgraded dovecot to version 2.4.1-4 which uses a completely different configuration syntax to all previous versions of dovecot. This is fixed in Warden 5.04 released on Oct 12th/2025:

Administrators must first upgrade to the latest version of Warden using our new product updater under Warden -> Settings -> Panel Application -> Application update or using the command below:

plesk bin extension --install-url https://www.danami.com/clients/downloads/warden.zip

After upgrading to Plesk 18.0.73 and latest version of Warden run the command below to upgrade the Warden dovecot configuration to the new format required for Plesk 18.0.73:

warden --task=antispam:learning:sieve --rebuild=yes --restart=yes

Now the issue should be fixed and dovecot should be running normally.

 

  • dovecot, Plesk 18.0.73, 99-warden
  • 9 Users Found This Useful
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