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Annotation of 43BSDReno/share/doc/ucs/mmdf/p0, revision 1.1.1.1

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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