Update: It looks like the spammers have finally found a way around this hack . The new spam bots apparently parse through the post page to find the correct name of the comment-posting script. Oh well, it was fun while it lasted.
For stopping this new wave of spam bots, I whole-heartedly recommend the WordPress auth-image hack.
You can read a little more about the authimage hack here.
The problem: Spammers use robots that target the wp-comments-post.php file to automatically enter spam comments into your blog.
The solution: This hack renames the wp-comments-post.php file and all related references to this file. So the spammers bot can’t find the posting file and therefore, can’t post spam on your site.
*Note: There is also a blank wp-comments-post.php file so that your error log doesn’t fill up with 404 errors and so that the spammer doesn’t receive a "not found" error and go searching for the renamed file.
Download WordPress Spam Stopper
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