To help minimize this
problem, we have added Appendix B, in which the many improvements of the intervening
versions of sendmail are categorized by chapter, complete with references to
the appropriate sections within this book.
Why This Book Is Necessary
King Gordius of Phrygia once created a knot so tangled that no one could undo it.
The Gordian knot stayed tangled, or so the story goes, until Alexander the Great
came along and took a different approach to untying the knot. With a sweep of his
sword, he parted the great knot once and for all.
It would be nice if the knot that is sendmail could be undone withone quick stroke
of freshinsigh t, but alas, it cannot. Instead, a more mundane approachmust be
taken, so in this book we untie the hard way, one strand at a time.
But, you might ask, ???Why the effort? Doesn??™t sendmail predate the dawn of computing
time? Hasn??™t the time come to replace sendmail with something new, something
This is the Title of the Book, eMatter Edition
Copyright ?© 2007 O??™Reilly & Associates, Inc. All rights reserved.
xvi | Preface
better, something modern???? Not so. Age has brought sendmail maturity and reliability.
The sendmail program has withstood the test of time because it is more than just
a program, it is a philosophy: a general-purpose, internetwork mail-routing facility
with the flexibility and configurability to solve the mail-routing needs of all sites
large or small, complex or simple.
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