qmail is used by hundreds of ISPs and thousands of other sites, including Hotmail since 1997, which has over 30 million users. qmail is popular because of its security, reliability, speed, low memory use, user-controlled mailing lists, straightforward administration, and much more! An Introduction to qmail is designed to guide system and mail administrators of all levels of experience through the installation, configuration, and maintenance of a qmail server. Dave Sill's background as a long-time qmail user, system administrator, and technical support agent gives hm the ability to address a wide audience. He also wrote "Life with qmail", a qmail guide published on the Web. See http://www lifewithqmail.org. Sill's book guides the reader through every step of the process in setting up and running a qmail server. Assistance is provided for making the various decisions that must be made throughout the process. Advanced topics such as mailing list managers, controlling spam, mailbox services, secure networking, troubleshooting, and performance tuning, are also covered. Sill also discusses qmail's features, history, and competition.