UnixReview.com says, "The author doesn't leave any stone unturned. He deals with the distinctly menacing sounding daemonized attack scripts, the pros and cons of encryption, running PHP in safe mode, and problems you may encounter when using open source applications. However, by showing how to thwart attacks, it indirectly shows how to make them. Perhaps this book should only be sold to a white list of trusted buyers so that "Dr. Evil" can never get his hands on a copy."
techbookreport.com states, "Slamming Spam is a book devoted to the sharp-end of anti-spam activity. Written primarily for system administrators, it's focused on offering practical guidance and implementation support for a wide range of anti-spam technologies. Aside from a foray into some of the technicalities of Bayesian filtering, there's not much in the way of theory or policy as the authors focus instead on the hands-on side of things."