Gavin Cameron bravely applied the checkcompat() examples to real-world situations,
thereby helping to debug that code for me. Mark D. Roth kindly reviewed the
ph database type and provided valuable clarification.
Needless to say, this book would not have been possible if Eric Allman had not written
sendmail in the first place.
For the second and fourth editions, Cricket Liu kindly reviewed the DNS chapter
and found several errors that slipped by everyone else.
George Jansen,* editor extraordinaire, has turned all my early drafts of new text into
a form suitable for publication. He has stuck with me through all editions and has
never tired.
Thanks and praise must go to Tim O??™Reilly for agreeing to do this book in the first
place. His experience has shaped this book into its current form. He was aware of the
???big picture??? throughout and kept his fingers on the pulse of the reader. Without his
advice, a book this complex and massive would have been impossible.
Additional thanks must go to Edie Freedman for gracefully accepting my unhappiness
with so many cover designs except the current one, which I consider perfect.
The production folks at O??™Reilly did a yeoman??™s job of achieving an outstanding finished
book. For the previous editions a special thank you to Barbara Willette for
copyediting, Nancy Kotary for help with final production, Kismet McDonough-Chan
* Author of The Jesse James Scrapbook and The Fade-away (http://www.
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