The $r
sendmail macro holds as its value the protocol
that is used in receiving a mail message (usually SMTP or UUCP, $r). The $s
sendmail macro holds as its value the name of
the sending host ($s). Some programs, such
as UUCP, need to be able to set the values of these macros from the
command line. The old way to set them looked like this:
-oMrUUCP -oMslady
Here, the M option sets $r to
be UUCP and $s to be
lady.
Under V8 sendmail the setting of
$r and $s has been simplified.
A command-line single switch, -p, can be used to
set them both:
-prval:sval
Here, the rval is the value assigned to
$r, and the sval is the
value assigned to $s. The two are separated by a
colon. If the sval is omitted, the colon
should also be omitted.
