The ${daemon_name} macro contains the value of the
DaemonPortOptions=Name option (See this section) whenever an inbound connection is accepted.
The names assigned in the default configuration file are MTA (for the
daemon that listens on port 25), and MSA (for the MSP daemon that
listens on port 587).
As distributed, this ${daemon_name} macro is not
used in the configuration file. It is, however, available to you for
use in designing your own particular rule sets. Note that a
$& prefix is necessary when you reference this
macro in rules (that is, use $&{daemon_name},
not ${daemon_name}).
${daemon_name} is transient. If it is defined in
the configuration file or in the command line, that definition can be
ignored by sendmail.
