Glad too help, up until 5 weeks ago I had been running SME server for about 18 months and it never had any problems. There are some addons that people have made for it as well. There is an anti-virus and anti-spam addon for it that works very well.

I love this how-to email server setup. It is wonderfully written, super easy to follow, and allows even the newest of noob to complete it, as it has everything written out for you. As you'll see, it has specific instructions for debian/dedrat/slack, as well as BSD and a few more. Great great site.

http://qmailrocks.org

peace,
JimBass