How do weighted dictionaries work?
Weighted dictionaries represent an effective content checking technology: dictionaries and phrases covering a particular subject area are grouped into a category, while a weighting algorithm ensures that a single occurrence of a word does not cause a threshold violation, filtering taking place only when the word occurs several times or a combination of words is found. Special dictionaries for anti-spam functions allow a differentiated configuration with a high degree of filtering. The effectiveness of this method depends to the weighting algorithm used. This is why some providers use the term heuristics in this context.
