~Spamassassin with Sendmail - How to get Spamassassin installed on a Redhat Linux system (can be any distro of Linux really) and get it to filter mail through Sendmail.

~Fetchmail+Spamassassin+Postfix - How to set up Fetchmail to grab your mail from an ISP, and process it through Spamassassin and Postfix WITHOUT the need for procmail. It's a pretty simple process!