I have managed to get the master quota working, but cannot get individual user quota to do anything.
Here is a line from /etc/dovecot/passwd: _kari@karico.ca:XXXXXXXXX:502:502::/var/mail/vhosts/karico.ca/kari::userdb_quota_rule=*:bytes=600M_
Also, based on this, the expire cron job says: Unknown dict module: db
# 1.1.6: /etc/dovecot.conf # OS: Linux 2.6.18-92.1.18.el5.centos.plusxen i686 CentOS release 5.2 (Final) log_path: /var/log/dovecot/dovecot.log info_log_path: /var/log/dovecot/dovecot.log protocols: imap pop3 imaps pop3s listen: 209.222.57.19 ssl_listen: 209.222.57.19 verbose_ssl: yes login_dir: /var/run/dovecot/login login_executable(default): /usr/libexec/dovecot/imap-login login_executable(imap): /usr/libexec/dovecot/imap-login login_executable(pop3): /usr/libexec/dovecot/pop3-login login_greeting: mail.karico.ca ready. login_greeting_capability: yes verbose_proctitle: yes mail_access_groups: virtual mail_location: maildir:~/Maildir mail_debug: yes mail_executable(default): /usr/libexec/dovecot/imap mail_executable(imap): /usr/libexec/dovecot/imap mail_executable(pop3): /usr/libexec/dovecot/pop3 mail_plugins(default): quota imap_quota mail_plugins(imap): quota imap_quota mail_plugins(pop3): quota mail_plugin_dir(default): /usr/lib/dovecot/imap mail_plugin_dir(imap): /usr/lib/dovecot/imap mail_plugin_dir(pop3): /usr/lib/dovecot/pop3 auth external: verbose: yes debug: yes debug_passwords: yes socket: type: connect master: path: /var/run/dovecot/auth-master mode: 384 auth default: verbose: yes debug: yes debug_passwords: yes passdb: driver: passwd-file args: /etc/dovecot/passwd userdb: driver: static args: uid=virtual gid=virtual home=/var/mail/vhosts/%d/%n socket: type: listen client: path: /var/run/dovecot/auth-client mode: 432 master: path: /var/run/dovecot/auth-master mode: 384 plugin: quota: maildir:User quota quota_rule: *:storage=1G quota_rule2: Trash:storage=20%% quota_rule3: Spam:storage=30%% quota_warning: storage=95%% /usr/local/bin/quota-warning.sh 95 quota_warning2: storage=70%% /usr/local/bin/quota-warning.sh 70 expire: Trash 7 Spam 30 expire_dict: db:/var/lib/dovecot/expire.db dict: expire: db:/var/lib/dovecot/expire.db