1 SENDMAIL -- An Internetwork Mail Router
5 Routing mail through a heterogenous internet presents many new
6 problems. Among the worst of these is that of address mapping.
7 Historically, this has been handled on an ad hoc basis. However,
8 this approach has become unmanageable as internets grow.
10 Sendmail acts a unified "post office" to which all mail can be
11 submitted. Address interpretation is controlled by a production
12 system, which can parse both old and new format addresses. The
13 new format is "domain-based", a flexible technique that can
14 handle many common situations. Sendmail is not intended to perform
15 user interface functions.
17 Sendmail will replace delivermail in the Berkeley 4.2 distribution.
18 Several major hosts are now or will soon be running sendmail.
19 This change will affect any users that route mail through a sendmail
20 gateway. The changes that will be user visible will be discussed.