Format: OPEN filename

    Opens the specified ASCII text file containing a MIME-formatted
    message. If no qualifier is specified, /READ (read-only) access
    is the default message access mode.

1    /DRAFT

    Specifies that the file is a draft of a message that was composed
    previously. This also implies write access to the file, to add or
    remove attachments. Draft files do not contain header information
    such as To:, From:, Cc:, and so forth.

    See the NEW command to create a new MIME message.

2    /READ

    Specifies that the file is to be opened for read access only.
    The default is the /READ qualifier.