DSPAM is an anti-spam solution based on Bayesian filtering and written by Jonathan A. Zdziarski, also known as the author of Ending Spam.
This type of filtering, based on learned keywords, has proven particularly effective after an initial learning phase. The main benefit of DSPAM in relation to its competitors lies in the depth of its analytical engine, as well as its user interactions, providing users with a web interface used to manage quarantines and to explicitly designate email as desirable or undesirable.
DSPAM is distributed under the GPL.
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