Read Pop-Up Menu
  Pressing MB3 in the message pane of a Read window
  displays the Read pop-up menu.
  The items on the Read window's pop-up menu let you
  forward, print, move, delete, recover, or extract the current
  message.  You can also send a reply using the current
  message.
  Pop-up menu actions always affect the object on which MB3
  is positioned.  Pop-up menu actions do not affect other objects,
  even if they are selected.
  Additional topics:
  *   Including a Message in a Reply
  *   Forwarding the Current Message
  *   Printing the Currently Displayed Message
  *   Moving the Currently Displayed Message
  *   Deleting the Currently Displayed Message
  *   Reversing the Move or Delete of the Current
      Message
  *   Creating a File From the Currently Displayed
      Message
  *   Using a Read Window