Paul Wolfe, "Anti-Spam Tool Kit"(Repost)

Every year businesses spend billions of dollars combating the overwhelming amount of junk email their employees receive. With the Anti-Spam Toolkit, systems administrators have at their fingertips the tools they need to significantly reduce junk email. Through real-world software and examples, the authors demonstrate how to identify spam, deploy the best-suited anti-spam system for a business, keep legitimate email from being mistaken for spam, adapt and improve anti-spam systems, and stay one step ahead of spammers. They also cover the latest and most popular technologies available on the market for the proactive systems administrator.