NerdTools Bad Bots Spam Defender
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Automatically denies comment access to known spammers in the NerdTools Bad Bots database.
Powered by NerdTools.co.uk, this plugin will automatically and anonymously check the authors IP address against the NerdTools Bad Bots Intrusion & Spam Detection database.
If a match is detected no commenting will be allowed and a custom error message will be displayed instead, if no match is detected commenting will be allowed as normal.
More information can be found at http://www.nerdtools.co.uk/badbots/