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Annotation of 43BSDReno/share/doc/ucs/mmdf/p0, revision 1.1

1.1     ! root        1: .TL
        !             2: MMDFII:
        !             3: A Technical Review
        !             4: .AU
        !             5: Douglas P. Kingston III
        !             6: .AI
        !             7: Ballistic Research Laboratory
        !             8: Aberdeen Proving Grounds, Maryland  21005
        !             9: <dpk@brl>
        !            10: .AB
        !            11: .PP
        !            12: The Multi-channel Memo Distribution Facility (MMDF) is one of
        !            13: the most sophisticated mail systems available for the UNIX\(dg
        !            14: .FS \(dg
        !            15: Unix is a trademark of Bell Laboratories.
        !            16: .FE
        !            17: operating
        !            18: system.
        !            19: MMDF is a mail transport system that supports a variety of
        !            20: user interfaces and delivery mechanisms. The design was not encumbered
        !            21: with the need to be compatible with existing mail systems, and as a
        !            22: result MMDF has a unified family of mail handling programs.  This review
        !            23: will discuss MMDF's design and operation, concentrating on those features
        !            24: that are unique to MMDFII, the latest release of MMDF.
        !            25: .PP
        !            26: MMDF's design allows it to grow from a
        !            27: single-host system to a large mail relay without degradation of mail
        !            28: system performance, and to degrade gracefully as the load becomes huge.
        !            29: The demands of a high volume mail relay have led to many of MMDF's
        !            30: innovative design choices.
        !            31: .PP
        !            32: Unlike some other systems, MMDF has separate processes for
        !            33: mail submission and delivery.
        !            34: Recent changes to the delivery software to permit intelligent
        !            35: retry strategies based on the retry history for each dead host will
        !            36: be explained.
        !            37: The effect of the new domain server
        !            38: mechanism on address validation will be discussed.
        !            39: .PP
        !            40: The separation of mail into channels is key to MMDF's ability to
        !            41: handle large amounts of mail. Each channel represents a different class
        !            42: of delivery and each channel has its own queue.  This isolates
        !            43: problems and allows one to
        !            44: provide different ``levels of service'' to different channels.
        !            45: .PP
        !            46: Other topics to be discussed will include available user
        !            47: interfaces, the mailing list processor, aliasing, runtime
        !            48: configuration, and domain based naming.
        !            49: .PP
        !            50: The MMDF system was originally developed at the University of Delaware
        !            51: and has since seen significant development work at the Ballistic
        !            52: Research Laboratory and University College London.
        !            53: .AE

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