generic spam filter tool

 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
  - Easy-to-use command line tool
  - Multilingual support (including CJKV)
  - Supports several embedded databases (SQLite and QDBM)