You can turn off trackbacks completely from your WordPress settings but remember this will completely remove any future trackbacks from all of your single post pages and also it doesn’t provide you any solution for past trackbacks. It only works for future. So instead you may try using following Simple Trackback Validation with Topsy Blocker Plugin.
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Register/transfer domain names at http://system.sangkrit.net and mail to system@sangkrit.net to get your web/app made/managed as per the budget allocated.
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