Copies a message to another folder without deleting it from the
    current folder. If the specified folder does not exist, it is
    created.

    If you want to copy a message to a sequential file (outside of
    Mail) instead of to a mail file, use the EXTRACT command.

    If you decide (after entering the COPY command, pressing Return,
    and supplying a folder name at the prompt, but before pressing
    Return again) that you do not want to copy the message, press
    Ctrl/C. Ctrl/C aborts the operation and keeps you within Mail.

    Format

      COPY  foldername [file-spec]