sendmail, 4th Edition

${daemon_addr}

---

Listening daemon's address

V8.10 and above

The sendmail program can listen for (await) inbound connections on more than one interface, where each interface can have one or more addresses associated with it. The ${daemon_addr} macro contains the address upon which the daemon was listening when it accepted the inbound connection. This macro is given the value declared by the DaemonPortOptions=Addr option (See this section) associated with that connection each time rule sets are called.

The format of the value stored in ${daemon_addr} is based upon the setting of the DaemonPortOptions=Family option (See this section). If that setting is inet (the default) or inet6 , the address in ${daemon_addr} will correspondingly look like one of the following:

 123.45.67.89   an IPv4 address  IPv6:2002:c0a8:51d2::23f4   an IPv6 address  

If the DaemonPortOptions=Addr option is undeclared, the default (with the inet family's format) becomes 0.0.0.0 for IPv4, or (with the inet6 family's format) IPv6:: : for IPv6.

This ${daemon_addr} macro is not used in the rule sets supplied with sendmail . It is, however, available for your use when designing custom rule sets. Note that a $& prefix is necessary when you reference this macro in rules (that is, use $&{daemon_addr} , not ${daemon_addr} ).

${daemon_addr} is transient. If it is defined in the configuration file or in the command line, that definition can be ignored by sendmail .