[Dovecot] Tracking logins

[Alex]

Hi,


I'm using dovecot-2.1.17 on fc18 and wondered if there is some
mechanism, perhaps a database,  that can store the logins/logouts for
each user? I realize there's something already logged to syslog, but
I'd like more of a history.

While lastlog is great for users that actually login, my dovecot users
don't login, just check email via pop and imap.

Any ideas greatly appreciated.
Thanks,
Alex