aremorteza

Bibot will protect your WordPress! No more spam comments and brute-force attacks against user accounts. Lightweight plugin – just few KBs to download and no ads!
Users are required to confirm that they are not a robot before the form can be submitted. It’s easy for people and hard for bots.
This WordPress plugin is used by the free <a href="https://bibot.ir" rel="nofollow ugc">Bibot service</a> as a third party.
For more information on how it works, refer to <a href="https://bibot.ir/docs" rel="nofollow ugc">Bibot documents</a>.
You can see our terms of use at <a href="https://bibot.ir/terms_of_use" rel="nofollow ugc">https://bibot.ir/terms_of_use</a>.
<h4>What is protected with bibot?</h4>
<ul>
<li>Comment form</li>
<li>New password form</li>
<li>Registration form</li>
<li>Login form</li>
<li>Reset password form</li>
</ul>
<h4>Thank you!</h4>
Thanks all of you, who are using this plugin. I really appreciate it! WordPress is amazing open-source software which I’m using for free (for business too) so this plugin is my way how to say thank you! 
If you write to me (on support center etc.) and expect an answer, be patient, please.

bibot

Simply protect your WordPress against spam comments and brute-force attacks!

Automattic

Donncha O Caoimh (a11n)

This plugin adds a stylesheet or image to your blog’s html source code. When a browser loads that stylesheet or image a cookie is dropped. If that user then leaves a comment the cookie is checked. If it doesn’t exist the comment is marked as spam. 
The plugin can also check how long it took a user to enter a comment. If it’s too fast it’s probably a spam bot. How fast can a legitimate user enter their name, email, web address and enter a well thought out comment?
For the adventurous, add these lines to your .htaccess and it will block spam attempts before they ever get to WordPress. Replace the Xs with the cookie that was set in your browser after viewing your blog. You can also find the cookie value by examining the page source code and looking for “css.php?k=XXXXXXXXXXXXXXXXXXX”. Make sure the lines go above the standard WordPress rules.
<pre><code> RewriteCond %{HTTP_COOKIE} !^.*XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.*$
 RewriteRule ^wp-comments-post.php - [F,L]
</code></pre>
If you use WordPress MU, replace wp-comments-post.php above with wp-signup.php to block spam signups.
<pre><code> RewriteCond %{HTTP_COOKIE} !^.*XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.*$
 RewriteRule ^wp-signup.php - [F,L]
</code></pre>

Cookies for Comments

If you don't use any other spam filter plugins, then you can rely on this to stop spam comments for sure!

Must have, if you don't use any other spam filters!

I'd been getting a dozen spams a day on two of my sites. We installed "Stop Spam Comments" on one and "Cookies for Comments" on the other. Both worked perfectly. No more spam. Thanks!



very easy and no more spam!

Sets a cookie on a random URL that is then checked when a comment is posted. If the cookie is missing the comment is marked as spam.

bibot vs Cookies for Comments