Top 10 WordPress Anti Spam Plugins
by Jonathan Clarke - Thursday, 1 March 2007.
Blog spam is a huge problem but fortunately protection is available and in a few steps you can make sure you are protected. Check out the plugins below, one of them will certainly suit your needs. Keep in mind that not all of the listed plugins have been confirmed as WordPress 2.1 compatible so do check out the details before you install them.

Akismet

When a new comment, trackback, or pingback comes to your blog it is submitted to the Akismet web service which runs hundreds of tests on the comment and returns a thumbs up or thumbs down. There's no maintenance or upgrading needed and it comes with WordPress.

Challenge

Challenge restricts comment spam by throwing the commenter a challenge. The default challenge is an addition and multiplication math question. The challenge and the answer can also be user-defined. They can be of anything including PHP-evaluatable expressions.

Referrer Bouncer

Use this plugin to bounce back referrer spam attempts. It requires no upfront configuration and no mod-rewrite. It is like the strong silent bouncer at your favorite club and it works well.

WPBayes

This plugin implements spam filtering using Naive Bayesian classifier. This plugin will automatically classify new comments as legitimate or spam based on past decision done by you. It requires modification to a few WordPress core files so it may not be suited for completely new users.

Comment Timeout

Selectively close comments on your blog to help reduce spam. It comes with an administration page and is fully configurable.

Email Immunizer

This plugin provides protection against email harvesters by taking email addresses and mailto links on your blog and converting their text to numeric character references.

ImgProtectr

ImgProtectr will take any text you pass to the imgProtectr() template tag and put an image with the specified text in it’s place. This is primarily intended for use in templates where you would have an email address displayed.

Did You Pass Math?

To make things very easy for a legitimate commenter, this small plugin asks the person making the comment to answer a simple math question. This is intended to prove they are a human being and not some kind of robot.

AuthImage

This plugin displays an image with some random text that the commenter has to enter in order for their comment to go through. This should cut down on any bots out there from spamming your comments area and perhaps remove the need for comment moderation.

WP-Hardened-Trackback

Hardened Trackback generates single-use, expiring trackback URLs with AJAX. Whenever someone tries to send a trackback without a valid key it will be ignored.

Spotlight

Intentional backdoors in iOS devices uncovered

Posted on 22 July 2014.  |  A researcher has revealed that Apple has equipped its mobile iOS with several undocumented features that can be used by attackers and law enforcement to access the sensitive data contained on the devices running it.


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