"qsf", a light-weight alternative to bogofilter?

[C. Fischer]

<URL:http://www.ivarch.com/programs/qsf.shtml>

(disclaimer:  i'm not the author of "qsf"!)

"qsf" has some interesting features:

- it can be built using third-party SQL databases, but also using only libc's
  binary tree routines.

- MIME-decodes all text/* parts with HTML tags removed, others are
  md5-checksummed and the checksums entered into the token database,

- all tokens are stored as md5 values, and a platform independant dump format
  exists.  thus users can share and merge databases without fear of disclosing
  private information(!),

- Users without write access to the system-wide database get their private
  databases in their $HOME.  read-only use of two system databases is
  possible.

- rudimentary whitelisting of sender emails is already integrated.  "qsf" will
  never mark emails from certain senders as spam.

- filters and pairs

- builtin filters tag special tokens such as images or executable attachments,
  whose appearance will eventually grade messages as spam,

- not only single tokens but also token pairs (i even saw groups of up to four
  words) become database entries.  this is a simple step towards phrase
  recognition.

i have done but few experiments with "qsf", but plan to train it once i found
a not-too-large, comprehensive spam-corpus fur further testing.  since "qsf"
documentation never mentions bayes, it would be interesting to hear other
people opinions about this similiar/dissimiliar product!

  clemens

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