Akismet is a great plugin to block spam comments/trackbacks. It detects spams completely. But, Akismet allows to accept unsolicited feedbacks, and to store them in the database. It is weaker act to fight with spams. A better way is to reject them.
Also, the architecture of WordPress is vulnerable for spammer. Because the comment API is fixed URL like: "wp-comments-post.php", "wp-trackback.php, or "http://blog.example.com/archives/99/trackback/". Therefore, spammers can easily post bulk comments/trackbacks to WordPress weblogs.
"Nonce, Please!" add a nonce (random strings) to the comment hidden field and/or the trackback URL. A valid comment and/or trackback should have a nonce string. Bulk feedbacks will not have nonce.
This plugins also verifies that a new comment/trackbacks has the valid nonce. If there is no nonce or an invalid one, the feedback is rejected.
Adding and verifying nonce is automatic, users are not do anything!
Spam Notifier
The plugin sends you an email each time a comment goes to the spam folder. The plugin will come in handy in combination with anti-spam plugins like Antispam Bee, Invisible Captcha and others that completely filter out comments from bots. It saves you the trouble of having to visit the "Spam" folder .........
Antispam for all fields
Plugin to reject spam. Port from same author from http://www.phpbbantispam.com
Actually visits the URL from commenter to spider for spamwords.
Also checks using StopForumSpam.com API
Compatible with many other anti spam plugins such as Akismet
Plugin does a lot more such as (this list does not c.........
WP-Hashcash
No More Spam
WP Hashcash is an antispam plugin that eradicates comment spam on WordPress blogs. It works because your visitors must use obfuscated javascript to submit a proof-of-work that indicates they opened your website in a web browser, not a robot. If the javascript check fails, WP Hashcash n.........
Anti-spam
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Captcha madness:
Why humans should prove that they are humans by filling captchas? Lets bots prove that they are not bots with adding javascript to their user-agents!
Anti-spam plugin blocks spam in comments automatically, invisibly for user.........
Spam Master
Spam Master was born out of need to protect our website against constant malicious spam registrations and comments that affect the majority of wordpress websites. We did it the TechGasp way... coded a brand new, clean and fast plugin that will make your professional wordpress website safe and clean..........
SI CAPTCHA Anti-Spam
Adds CAPTCHA anti-spam methods to WordPress forms for comments, registration, lost password, login, or all.
In order to post comments or register, users will have to type in the code shown on the image.
This prevents spam from automated bots. Adds security. Works great with Akismet. Also is fully WP.........
WP-SpamFree Anti-Spam
An extremely powerful WordPress anti-spam plugin that eliminates blog comment spam, including trackback and pingback spam. Finally, you can enjoy a spam-free WordPress blog! Includes spam-free contact form feature as well....
NFCBC SEO Light
NFCBC SEO Light - The light version of Nofollow Case by Case?
You might have heard rumours about pagerank sculpting (old school -> new school).
You might have heard about follow and nofollow links.
You might not love the idea of blocking every single comment link.
You might not love the idea .........
WP-Hashcash Extended
No More Spam
WP Hashcash is an antispam plugin that eradicates comment spam on WordPress blogs. It works because your visitors must use obfuscated javascript to submit a proof-of-work that indicates they opened your website in a web browser, not a robot. If the javascript check fails, WP Hashcash n.........
WP-SpamShield Anti-Spam
An exceptionally powerful and user-friendly WordPress anti-spam plugin that eliminates comment spam, trackback spam, contact form spam & registration spam....
