HostingFu: Greylisting spams with Postfix + Gld. I have previously used only Amavisd + SpamAssassin + ClamAV, but the amount of incoming spams really work my poor server hard. After running greylisting for a month, spams virtually disappeared from my inbox. Highly recommended if you are running your own mail server.
Scott Yang's Playground
Faith, Technology and Randomness in Life, According to Scott
Sep 1 2006