9Feb/110
Track Dovecot User Last Login Date and IP Address
Idea how to implement tracking last user pop3 or imap login date using dovecot is described in Dovecot Wiki.
23Jan/110
Server side mail filtering with dovecot and squirrelmail
Maybe you know, maybe not, but pre-build Debian Lenny packages of dovecot from backports has been built with sieve plugin.