Language Filter

The language filter is the easiest way to mark an entire subset of message types as spam: filter out those messages in foreign languages you get unreadable spam from.

The language filter does a statistical analysis of the language the message is written in. This does work more or less quite well, but it has a good chance to fail for short messages and for 'mixed' languages (imagine a german message with some program language source examples parts). It works good for languages with different char set like Japan or Russian.

The test creates a relative high load (-> needs its time, no slowdown ), no matter how many languages are selected.