SS$_NORMAL         Normal successful completion.
    MAIL$_CONITMCOD    The specified item codes define conflicting
                       operations.
    MAIL$_INVITMCOD    The specified item code is invalid.
    MAIL$_INVITMLEN    The specified item length is invalid.
    MAIL$_MISREQITEM   The required item is missing.
    MAIL$_OPENIN       The required file is missing.
    SS$_ACCVIO         Access violation.