Conclusion

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In this chapter you learned about some advanced qmail topics including single-recipient delivery, VERP, scalable servers, and integrating qmail with LDAP, SQL, and virus scanners.

In the appendices, you'll learn more about how qmail works, how Internet mail works, and what other packages are often used with qmail. You'll also look at qmail's features in a little more depth than in Chapter 1, and you'll investigate qmail's error messages and some of the "gotchas"—quirks in the way qmail works that often cause trouble for beginners.

Throughout the course of this book's twelve chapters, you should have learned everything you need to know to install, configure, maintain, and use a qmail server. You should be able to configure systems for everything from desktop null clients using mini-qmail to multisystem, scalable server farms capable of supporting thousands of users. You should also know where to turn for help resolving problems you can't figure out on your own, especially the qmail mailing list for do-it-yourself help and hired consultants when you need professional help. Also, don't forget to check the book's Web site (http://www.apress.com/) for corrections, clarifications, and downloadable scripts used in the book, as well as other goodies.

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