This experimental WordPress Plugin by Andrei Vereha will work with the API on BitDefender’s cloud based scanning servers to ensure no spam hits your blog. This version of BitDefender AntiSpam for WordPress was released as PREVIEW.
The analysis is made on a remote server where messages are run through a series of filters. Depending on the total score, the comment is categorized as spam or legit.
Plugin homepage: http://labs.bitdefender.com/project/bitdefender-antispam-solution-for-wordpress-13.html