Sir-Uli

This plugin provides a possibility to block comments based on words of a predefined list. The built-in lists of wordpress only allow to send comments to the moderation- or to the spam-queue but not to block them completely. This is remedied with this plugin, which allows to block comments based on a definable list.
Attention #1: Use wordlist with care, there is no logging of the blocked comments!
Attention #2: It will also match inside words, so “press” will match “WordPress” as well!

WU – Block comments

This plugin provides a possibility to block comments based on words of a predefined list.

yehudah

A unique anti-spam solution to help you fight spam in registration, comments, forms (Contact Form 7). 
When the user comment or using contact form 7 his comments or message will not sent or be visible until 
the user will press a unique link sent to him when he submited his message.
<h4>For Example:</h4>
Think like this i’m a spammer registering to your site, after register to your site i see a message about 
the need to activate my account, if i used fake email address this address will be blocked because it’s never 
activated, if i used a real address i activated my account with success ! 
Now i would like to change my email address so i can spam without getting any messages from your site but oops 
i can’t change my email address because the plugin blocking it ! 
Ok let’s try my luck and start spam in the commnets, posting my first comment and getting a message: 
“to see the comment you must approve your comment by pressing the link in your email address”.
I think you got the idea but what would happen if i will not press it the email and the ip address will be blocked because no one press the link, if i did press the link in the second on the third time YOU as site admin can block 
his ip and email address manually in the plugin options.
Plugin Features:
<ul>
<li>User activation by email.</li>
<li>Block user from changing is email address – EVEN BY ROLE !</li>
<li>Protect from spam commnets by sending unique url approve to the user email address – EVEN BY ROLE !</li>
<li>Auto learn mode – unverify users or comments will be deleted after time interval you choose.</li>
<li>Recaptcha protection for registration.</li>
<li>Recaptcha protection for login.</li>
<li>Recaptcha protection for commnets – EVEN BY ROLE.</li>
<li>Ban user from register or comment by ip or email.</li>
<li>Customise email notification to the users.</li>
<li>Import and export option to save plugin settings.</li>
</ul>

WASP – Anti Spam

A unique anti-spam solution to help you fight spam in registration, comments, forms (Contact Form 7).

WU – Block comments vs WASP – Anti Spam