Tested

Configuring Roundcube to allow changing passwords in vmail

1. enable the password plugin in Roundcube
2. change dir to your roundcube installation directory, e.g. /var/www/roundcube
3. copy the default config for password: cp plugins/password/config.inc.php.dist plugins/password/config.inc.php
4. change the value of $['password_algorithm'] to 'dovecot'
5. uncomment the $config['password_dovecotpw'] line for dovecot-2.x and comment the line for dovecot-1.x
6. change the value of $config['password_dovecotpw'] to '/usr/bin/doveadm pw'
7. change the value of $config['password_dovecotpw_method'] to SHA512-CRYPT
8. set $config['password_dovecotpw_with_method'] to true
9. in $config['password_db_dsn'] insert the DSN of your vmail db/user, e.g. 'mysql://vmail:password1234@localhost/vmail' Note: the given user has to have write access to the vmail database
10. set $config['password_query'] 'UPDATE accounts SET password=%P WHERE username=%l AND domain=%d LIMIT 1'

That’s it! You should change the name of the database if you used an other name than vmail.

---