Sylfilter is a generic message filter library and command-line tools. it provides a bayesian filter which is very popular as an algorithm for spam filtering. sylfilter also supports multilingual and can be applied to any languages. it is implemented with c language and runs fast with small resources.

- very lightweight and fast
- provides learning-type junk filter
- multilingual support (including cjkv)
- simple and flexible library apis
- supports several embedded databases (sqlite and qdbm)