Sends a message to the sender  of  the  message  you  are  currently
  reading or the one you last read.  If you do not specify the name of
  a file to be sent as your reply, you will be prompted for  the  text
  of your reply.  You can use the REPLY command and the ANSWER command
  interchangeably because they work the same way.

  One of the two qualifiers (/EDIT and /LAST) can  be  specified.   If
  you specify both qualifiers, the /EDIT qualifier is ignored.

  You must be reading a message in order to reply to it.

   Format:

       REPLY [file-spec]

Additional information available:

ParametersQualifiersExamples

 file-spec

  Indicates the name of the file to be sent as a reply.

Additional information available:

/EDIT/EXTRACT/LAST/SELF

 /EDIT

 Calls the EDT editor to edit the reply you  are  sending.   When  you
  EXIT  from EDT the edited message is sent.  To cancel the sending of
  the message, enter the EDT command QUIT.

 /EXTRACT

 Invokes the EDT Editor to enable you to edit the current  message  to
  which you are replying.

 /LAST

 Specifies that the last message you sent be  used  as  text  for  the
  reply.

 /[NO]SELF

 Determines whether or not MAIL sends a copy of the response  back  to
  the  user who is responding to the message.  The default is /NOSELF,
  unless you have used the  SET  COPY_SELF  command  to  specify  that
  copies be sent to yourself automatically.

  1.
       MAIL> REPLY/EXTRACT
       To:      FLAXEN::STARCK
       Subj:    RE:Verbosity

       This text was mailed to a user named Starck.
       [EOB]
          .
          .
          .
       *EXIT
       DISK$:[STARCK]MAIL.TMP;1 17 lines
       MAIL>

  This example shows how to use the /EXTRACT qualifier  to  edit  your
  response to a user named Starck on node FLAXEN before sending it.

  2.
       MAIL> REPLY/SELF
       To:      FLAME::CORSTAN, HOWE
       Subj:    Re:  Ecology
       Enter your message below.  Press CTRL/Z when complete, or CTRL/C to quit:
          .
          .
          .
       New mail on node MARBLE from HOWE

  This example shows how a user named HOWE on node MARBLE replies to a
  user  named CORSTAN on node FLAME.  The /SELF qualifier enables MAIL
  to return a copy of the reply back to HOWE.