Deletes either the message you are currently reading or the  message
  you just read and moves it to the WASTEBASKET folder. You may also
  delete several messages by using a range or list of messages.

  When you enter the EXIT or PURGE commands, your  WASTEBASKET  folder
  empties automatically.

  To recover a message accidentally deleted (while it is still in  the
  WASTEBASKET folder), SELECT the WASTEBASKET folder, READ the desired
  message, and MOVE it to another folder.

   Format:

       DELETE [message-list]

Additional information available:

ParametersQualifiersExamples

 message-list

  Deletes the message(s) specified by a number. You can specify only
  one number, a list of numbers, or a range of numbers.

Additional information available:

/ALL

 /ALL

 Deletes all the currently selected messages.
  Select  a folder by entering the SELECT command followed by the name
  of the folder.  (See the SELECT command for more information.)

  1.   MAIL> DIRECTORY

                                                         MAIL
       #   From    Date             Subject

       1   MOON    11-APR-1988        Asteroids

          .
          .
          .

       5   MARK    11-APR-1988        The Yen
       6   MARK    11-APR-1988        The Buck

       MAIL> 5
       MAIL> DELETE
       MAIL> 6
       MAIL> DELETE
       MAIL> DIRECTORY

                                       MAIL
       # From      Date           Subject

       1 MOON    11-APR-1988      Asteroids
          .
          .
          .
       5 (Deleted)
       6 (Deleted)


  This example shows how to delete messages 5 and 6 from the MAIL
  folder. Enter the DIRECTORY command to show that these messages
  are deleted.
1.   MAIL> DELETE 1,3,5-7,9:11

  This example shows how to delete a list and range of numbers by
  using the hyphen and colon. Messages 1,3,5,6,7,9,10 and 11 are
  deleted.