Powered by NerdTools.co.uk, this plugin will automatically and anonymously report the authors IP address for any comment that is classed as spam to the NerdTools Bad Bots Intrusion & Spam Detection database.
The Bad Bots database keeps track of hundreds of thousands of bots that try and exploit and spam servers and websites world wide which is then used in applications such as NerdTools Bad Bot Spam Defender which checks every comment authors IP address against the database to detect and prevent known offenders from causing further spam.
This plugin is simple to use, follow the installation instructions and you will be contributing in no time.
More information along with stats and the NerdTools Bad Bots Spam Defender plugin can be found at http://www.nerdtools.co.uk/badbots/.