16.3 Host/Hub/Boss routing

     Messages not otherwise prevented from being routed will by
     default be sent to the destination system's HOST (see "Nodelist")
     if the destination system is outside your own net and to its HUB
     if it is within your own net.

     If you have mail for a system listed as DOWN in your nodelist
     database, it will never be packed. If the system calls your
     system to pick up mail, it will receive its mail.

     If you have mail for a system listed as HOLD or PVT (no telephone
     number) in your nodelist, the default behavior is to send the
     mail via the system's Host, Hub, or Boss. If the mail to a HOLD
     or PVT listed system contains file attaches, the mail packet will
     by default be placed on hold for the Host/Hub, or go directly to
     the Boss in the case of a point.

     Messages to systems not in your nodelist (unlisted systems) will
     not be Host/Hub routed by default, but they can be routed by
     using route verbs.

     Messages with Crash, IMM or Direct status, destined for points to
     which FD cannot place a call directly will retain its status (and
     restrictions), but FD will instead assume the point system's Boss
     as the destination.