This book examines anti-spam measures in terms of their potentials, limitations, advantages, and drawbacks. These factors determine to which extent the measures can contribute to the reduction of spam in the long run. It examines legislative, organizational, behavioral, and technological anti- spam measures, including an insight into their effectiveness. In addition, it presents the conceptual development and analysis of an infrastructural e-mail framework, which features such a complementary application, and considers deployment issues.