Have you seen a WP-site, which can do that kind of neat-trick of preventing comment spammers from reaching the comment box? This anti-spam tool, works like a token system. And if you're comments were marked as spam, When you refresh the post, the comment box already disappeared. I know it sounds a little bit weird, but have you experienced that before? A Comment-disappearing technique to avoid spam? Any enlightenment will be appreciated. Thank you,
You don't need any special plug in, WP comes with Askimet already standard with the installation, you just need a API key from Wordpress.com. After that you can just set your comments to require an admins approval for extra added security and you'll be all set.