Milton Calnek wrote:
I use MailScanner with SpamAssassin and swear by it!
Happy (mostly), very vital list group. The author is very actively answering questions and requests. Can't get much better support!
mailscanner +1
MimeDefang is good too, and perhaps a little more efficient. It and clamav (if you want to tie in a virus scan for windows clients) are packaged in rpmforge. MimeDefang runs as a sendmail milter (i.e in real time during the smtp conversation) and gives you a small snippet of perl where you can control most of your mail scanning and delivery behavior.