Forwarder Station Name Macro and Class (F)

The F macro defines the station name or alias of the station to which this station forwards mail for unknown stations or domains.

The F class contains all known names for the station defined in the F macro.
Mail is sent to the forwarder as a last resort only if one of these conditions exists:
- This station cannot make the destination station name canonical or determine an appropriate relay or mail exchanger for the mail.
- The appropriate station, relay, or exchanger for the mail exists outside the top-level domain. (See the description of the T macro later in this section.)
If either condition for sending mail to this forwarder station exists, this station puts messages to unknown stations or domains "on the wire" and hopes for the best.
If no such station exists in your environment, leave the F macro and class empty. If this station is the forwarder station, put this station's name in the F macro. Put all known names for the station in the F class.