Simple Trackback Validation Plugin for WordPress 2.0.x and 2.1 performs a simple but very effective test on all incoming trackbacks in order to stop trackback spam.
When a trackback is received, the plugin retrieves the web page located at the URL included in the trackback. If the page contains a link to your blog, the trackback is approved. But if the page does not link to your blog, the trackback is placed into the comment moderation queue (or optionally marked as spam).
Since most trackback spammers do not set up custom web pages linking to the weblogs they attack, this simple test will quickly reveal illegitimate trackbacks. Also, bloggers can be stopped abusing trackback by sending trackbacks with their blog software or webservices without having a link to the post.
Installation and Usage
This plugin can be installed in 4 easy steps:
- Download Simple Trackback 1.2, and extract to a local folder.
- Upload extracted contents to wp-content/plugins/ folder.
- Activate from the plugin page in the WordPress admin panel.
- Optional: Go to WordPress Administration > Options > Simple Trackback Validation, adjust the options and save.
Trackbacks that have not passed the validation are placed into the comment moderation queue (WordPress Administration > Manage > Awaiting Moderation).