At a typical site, a significant number
of mail-related problems turn out to be problems with one of these other areas rather
than with sendmail.
The DNS is well documented in the book DNS and BIND, FifthEdition by Paul
Albitz and Cricket Liu (O??™Reilly).
The protocols used to communicate over the Internet are well documented in the
book TCP/IP Network Administration, Third Edition by Craig Hunt (O??™Reilly).
Finally, many mail problems can be solved only by the system administrator. The
sendmail program runs as root and can be installed and managed only by root. Th e
art of functioning effectively as root is superbly covered in the UNIX System Administration
Handbook, Third Edition by Evi Nemeth, Garth Snyder, Scott Seebass, and
Trent R. Hein (Prentice Hall).
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