This book is a quick starter for people wanting to set up a mail server using qmail, a secure, reliable, efficient, simple message transfer agent. Designed for internet-connected UNIX hosts, qmail is the second most common SMTP server on the Internet, and has by far the fastest growth of any SMTP server. Its straight-paper-path philosophy guarantees that a message accepted into the system will never be lost. It also supports maildir, a new, super-reliable user mailbox format. Targeted at System Administrators who need to set up qmail, this book gives practical examples ready for immediate use, but also explains the basics behind each example. Starting with setting up a qmail server, it takes the reader through virtualization, filtering, and advanced features like hosting multiple domains, mailing lists, and SSL Encryption. Finally, it discusses the log files and how to make qmail work faster. Author Kyle Wheeler has been setting up and maintaining qmail-based email servers since 2000.