The $# RHS operator serves two functions. The
first is to select a delivery agent, the second is to return the
status of a policy-checking rule set (such as
When used as a prefix to the RHS in one of the policy-checking rule
sets, the $# operator tells
sendmail that the message should either be
rejected, discarded, or accepted. Consider the following three rules:
R $* $| REJECT $# error $@ 5.7.1 $: "550 Access denied"
R $* $| DISCARD $# discard $: discard
R $* $| OK $# OK
The first rule shows how the $# prefix is used in
the RHS to specify the error delivery agent, which
will cause the message to be rejected. The error delivery
agent is fully described in error.
The second rule shows how the $# prefix is used in
the RHS to specify the discard delivery agent,
which will cause the message to be simply discarded. The
discard delivery agent is fully described in discard.
The last rule shows how the $# prefix is used in
the RHS to specify that the message is acceptable, and that it is OK
to deliver it.
Note that the $# in the RHS must be used as a
prefix or it loses its special meaning. See Section 18.7.5 for a full description of this operator.