Prevent people from registering via your comment moderation blacklist.
Actually visits the URL from commenter to spider for spamwords.
For test how it work simply install it and try to make a new comment in blog (or bbpress plugin if you have installed) with email (or ip address – may …
Protect your blog from comment spam and blocks other spam attacks in real time.
NURCaptcha inserts a reCAPTCHA on the Register Form of your site to protect it against spambots.
Check comment against the SpamBot Search Tool using the IP address, the email and the name of the poster as search criteria.