Thunderbird Sieve Add-on

Mozilla Thunderbird needs the sieve service installed to run that add-on.

Install the sieve daemon

On Ubuntu, run

apt install dovecot-managesieved

Enable ManageSieved on port 4190/tcp

vi /etc/dovecot/dovecot.conf
protocols = imap pop3 sieve
service dovecot restart

Check configuration

netstat -putan | grep 4190
tcp        0      0  *               LISTEN      5464/dovecot
tcp6       0      0 :::4190                 :::*                    LISTEN      5464/dovecot

Sieve rules are located in


The active sieve rule is usually a symlink to ispconfig.sieve

.sieve -> sieve/ispconfig.sieve

Open firewall

ufw allow 4190/tcp

Install Thunderbird Sieve Add-on

Enable sieve filter for IMAP account

See also