This book treats qmail more as an architecture than a mail server, and from that perspective guides the reader through the installation, administration, customization, and deployment of a qmail-based server. The book begins with a quick, minimal, step-by-step walkthrough of a bare-bones qmail server, and then introduces and explains the basic design of the qmail architecture in easily understood terms. The later chapters of the book are devoted to using qmail to provide specifi c features through customization and optimization. Alternative methods of providing each feature are compared, and a plethora of example scripts are provided to demonstrate the concepts and techniques.