MAIL$_INVITMCOD    The specified item code is invalid.
    MAIL$_INVITMLEN    The specified item length is invalid.
    MAIL$_MISREQITEM   The required item is missing.
    MAIL$_NOFILEOPEN   The mail file is not open.
    MAIL$_NOTISAM      The message file is not an indexed file.
    MAIL$_OPENIN       Mail cannot open the file as input.
    SS$_ACCVIO         Access violation.
    Any condition value returned by $CLOSE, $OPEN, $PARSE, and
    $SEARCH.