Black words
Black
words are effective for filtering spam by message subjects. This method
is
especially convenient for filtering spam on the server because it requires message
headers only.
Every word in the list of black words has a spam ratio. It is an integer that equals
to the number of messages marked as spam that have this words in their subjects. The plug-in
optionally updates the list of black words automatically during training. If any of
the black words appear in a normal message, it will be deleted from the
list.
The plug-in counts black words with a spam ratio greater than or equal to the
value specified in the settings.
By default, a message is considered as spam if it has at least one black word
in its subject whose spam ratio is large enough. If you raise the minimum number
of black words required for considering message as spam, the probability
of mistakes will be lower.
The list of black words may be either edited manually or updated automatically during training.
You can export and import the list of black words as UTF8 strings.
You can find more detailed description of this method online:
http://antispamsniper.com/art-black-words.html