While we're talking about mail, I've been experimenting a bit with iRedMail. It's *awesome*.
It bundles together your whole mail platform, including Dovecot and Postfix for mail handling; SOGo for Outlook and ActiveSync clients; Roundcube for webmail access... but it also bundles in Postscreen (sanity checking for SMTP transactions), Amavisd (mail virus scanning), greylisting (rejects new senders and requests retry), and other filters.
The whole thing is really very tidy. Even sends nightly log files that display numbers of rejected emails (so far averaging 1800 a day), sent mails, received mails, and failed HTTP requests.
Highly recommended :)
Sounds like excellent material for a presentation! :-) Cheers, Peter -- Peter Reutemann Dept. of Computer Science University of Waikato, NZ +64 (7) 858-5174 http://www.cms.waikato.ac.nz/~fracpete/ http://www.data-mining.co.nz/