Description

   Use the HOLD command to mark as held any messages which should
   temporarily be placed on "hold". PMDF will not attempt to deliver
   any messages which are marked as held. To resume processing of a
   held message, use the RELEASE command. Messages which have been
   held can be listed with the DIRECTORY/HELD command.

   The messages to be held are specified by their message
   identification numbers shown by the most recent DIRECTORY
   command. That number appears in the leftmost column of the
   DIRECTORY command listing. Ambiguous message numbers must be
   qualified by the proper channel name with the /CHANNEL qualifier.