1.MAIL> SHOW COPY_SELF
      Automatic copies to yourself are disabled

      This example shows the message Mail displays when you have not
      used the SET COPY_SELF command and you enter the SHOW COPY_SELF
      command.

    2.MAIL> SET COPY_SELF SEND, REPLY
      MAIL> SHOW COPY_SELF
      Automatic copy to yourself on SEND, REPLY

      This example shows how to use the SET COPY_SELF command to
      enable copies of mail messages you send to be returned back to
      you. The SHOW COPY_SELF command indicates that you have enabled
      automatic copying when you enter the SEND or REPLY commands.