$=m
List of local domains V8.7 and later
When sendmail first begins to
run, it figures out what your DNS domain is and
assigns the result to the $m macro ($m on
page 833). The sendmail program
then processes the configuration file. This gives
you the opportunity to redefine $m. After that,
sendmail assigns the final
value in $m to
the class $=m.
Unfortunately, prior to V8.10
sendmail, the class macro
$=m was not
used by sendmail, or by any of
the configuration files produced by the
m4 technique. Beginning with
V8.10, $=m is
used as part of screening to allow relaying. Note
that $=m should
not be used to have mail accepted as local under a
variety of domains. Instead, use FEATURE(domaintable)
(FEATURE(domaintable) on page 621).
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