BSD 4_3 development

Work on file usr/src/usr.lib/sendmail/doc/usenix

Synthesized-from: CSRG/cd1/4.3

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+Greg--         Here is the abstract.  My network addresses are
+ostensibly "eric@Berkeley.ARPA" (host 10.2.0.78) and ucbvax!eric;
+the address "eric@UCB-ARPA.ARPA" may be more inclined to get to
+me.
+
+
+          SENDMAIL -- An Internetwork Mail Router
+                       Eric Allman
+                    Britton-Lee, Inc.
+
+Routing mail through a heterogenous internet presents many new
+problems.  Among the worst of these is that of address mapping.
+Historically, this has been handled on an ad hoc basis.  However,
+this approach has become unmanageable as internets grow.
+
+Sendmail acts a unified "post office" to which all mail can be
+submitted.  Address interpretation is controlled by a production
+system, which can parse both old and new format addresses.  The
+new format is "domain-based", a flexible technique that can
+handle many common situations.  Sendmail is not intended to perform
+user interface functions.
+
+Sendmail will replace delivermail in the Berkeley 4.2 distribution.
+Several major hosts are now or will soon be running sendmail.
+This change will affect any users that route mail through a sendmail
+gateway.  The changes that will be user visible will be discussed.