Description

   For many channels, delivery history information is appended
   to the end of each message file after an unsuccessful delivery
   attempt has been made. With the HISTORY command, this information
   can be displayed.

   The messages to show histories for 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.

   Note that history information is not recorded by some channels.