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MAIL Routines, MAIL$MAILFILE_OPEN, Condition Values Returned
 *Conan The Librarian 

    MAIL$_FILEOPEN     The mail file is already open.
    MAIL$_INVITMCOD    The specified item code is invalid.
    MAIL$_INVITMLEN    The specified item length is invalid.
    MAIL$_MISREQITEM   The required item is missing.
    MAIL$_NOMSGS       No messages are available.
    SS$_ACCVIO         Access violation.
    Any condition value returned by LIB$GET_VM, $CONNECT, and $OPEN.
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