DNS-anti-spam is a plugin to protect your weblog from spam-comment. It checks the IP address the comment is posted from against a few blacklists, and
Display number of blocked access attempts by the Bad Behavior Plugin. (Original mysql function by Mark Jaquith).
Performs a simple but very effective test on all incoming trackbacks in order to stop trackback spam.
Prevent registration spam and bots login by adding custom captcha tests in the registration page and/or login page
The plugin adds links to bloggers posts for readers to contact them without scripts or work-a-rounds like my email is john (at) doe.com.
Allows you to display a captcha on your comment form to avoid spam.
Security Captcha es un sistema para prevenir spam de cualquier tito, tanto por personas como por scripts creados por personas.
Anti-spam by verify code that displayed in the image under the comment form.
Visitors to your site are forced to preview their comment prior to submitting it.