How to stop SPAM trackbacks in WordPress 

// Nearly every #Wordpress  blog will start getting spam trackback requests shortly after they have it's first few visitors. If you're not familiar with trackbacks, it's an automated method to get notified (and add link back) when someone links to your blog. Trackbacks are by default enabled in WordPress installations. 

To the rescue come the Simple Trackback Validation #plugin by Tobias Koelligan (following previous work by Miachel) which runs several tests (like checking the IP of the request as well as the actual URL of the page that supposedly linked to you) on #trackback  requests and finds out if they are legitimate or not. 

See the screenshot of settings for more details and download here

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