16.4 Qualifying systems

     Before FD will send mail to a system, it must be qualified by
     specifying its address, or a macro that includes its address in a
     SCHEDULE block (this is not true for IMM mail as previously
     described).

     You can qualify a system by placing a SEND-TO statement in the
     global section of a route file, but this is NOT RECOMMENDED.
     SEND-TO, POLL and the optional SEND-LIST after a Schedule command
     are the only available methods to qualify a system for mailing.

     If FD cannot find ROUTE.FD, mail to all systems will be put on
     hold for the destination system to call in and pickup its mail.