We’ve divided this book into one introduction and four parts, each addressing a particular aspect of sendmail.
Chapter 1 will be of special help to the new user. It covers the basic concepts underlying mail delivery and the roles sendmail plays in that delivery.
Part I covers compilation, installation, and configuration of sendmail, and the other programs supplied with the sendmail source.
Part II for more experienced users, covers general administration, including performance tuning, handling spam, rule testing, and more.
Part III covers all aspects of the configuration file in detail, and includes complete reference sections.
Part IV contains the appendices.