Knowledgebase

After upgrading to Plesk 18.0.73 released on Sept 30 dovecot refuses to start with the error:

Sep 30 08:34:40 el10p18.danami.com dovecot[25900]: doveconf: Fatal: Error in configuration file /etc/dovecot/conf.d/99-warden.conf line 10: Unknown section name: plugin

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.

To temporarily fix the issue edit the file /etc/dovecot/conf.d/99-warden.conf and replace it with the following:

If your spam action under Warden -> Content Filter Settings -> Policy Settings is set to "move" to spam folder (the default) then replace it with the following:

service imap {
  vsz_limit = 512MB
}

protocol imap {
    mail_plugins {
        imap_sieve = yes
    }
}

sieve_plugins {
    sieve_imapsieve   = yes
    sieve_extprograms = yes
}

sieve_global_extensions {
    vnd.dovecot.pipe = yes
}

sieve_pipe_bin_dir = /usr/local/bin/dovecot-sieve

sieve_script global-after {
    type = after
    path = /var/qmail/popuser/warden-server.sieve
}

If your spam action under Warden -> Content Filter Settings -> Policy Settings is set to "quarantine", "block", or "tag" then replace it with the following:

service imap {
  vsz_limit = 512MB
}

protocol imap {
    mail_plugins {
        imap_sieve = yes
    }
}

sieve_plugins {
    sieve_imapsieve   = yes
    sieve_extprograms = yes
}

sieve_global_extensions {
    vnd.dovecot.pipe = yes
}

sieve_pipe_bin_dir = /usr/local/bin/dovecot-sieve

Restart Dovecot

systemctl restart dovecot

Important: Do not change the server wide policy settings under Warden -> Content Filter Settings -> Policy Settings after applying the fix otherwise it will be reverted and dovecot will refuse to start again. This will be permanently fixed in Warden 5.03 which will be released in the next few days.