People still setup mail servers? amazing, I actually thought I was the last hold out to host my own email. I used to be all crazy into qmail (and then later postfix), with spamassassin, clamav, etc. It wasn't until about 5 years ago I ran into Surgemail while reviewing solutions for a former employer. http://netwinsite.com/surgemail/ it's worth a look if you are into hosting your own mail. I rarely, if ever plug commercial software, but these guys have really earned it. From their awesome support, development, and licensing model, it's just all around impressive.