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+At one time, the only Mail Transfer Agent (MTA) software easily available
+was sendmail(8). As a result of this, most Mail User Agents (MUAs) such
+as mail(1) had the path and calling conventions expected by sendmail(8)
+compiled in.
+
+Times have changed, however. On a modern NetBSD system, the administra-
+tor may wish to use one of several available MTAs.
+
+It would be difficult to modify all MUA software typically available on a
+system, so most of the authors of alternative MTAs have written their
+front end message submission programs so that they use the same calling
+conventions as sendmail(8) and may be put into place instead of
+sendmail(8) in /usr/sbin/sendmail.