MAIL$_MAILFILE_DELETED_BYTES

    When you specify MAIL$_MAILFILE_DELETED_BYTES, MAIL$MAILFILE_
    INFO_FILE returns the number of deleted bytes in a specified mail
    file as longword value.

 MAIL$_MAILFILE_RESULTSPEC

    When you specify MAIL$_MAILFILE_RESULTSPEC, MAIL$MAILFILE_INFO_
    FILE returns the resultant mail file specification. The buffer
    address field of the item descriptor points to a buffer that
    receives a character string 0 to 255 characters long.

    Specify a value from 0 to 255 in the buffer length field of the
    item descriptor.

 MAIL$_MAILFILE_WASTEBASKET

    When you specify MAIL$_MAILFILE_WASTEBASKET, MAIL$MAILFILE_INFO_
    FILE returns the name of the wastebasket folder of the specified
    mail file. The buffer address field of the item descriptor points
    to a buffer that receives a character string 0 to 39 characters
    long.

    Specify a value from 0 to 39 in the buffer length field of the
    item descriptor.