Hello, I am trying to make a script that sends trackback notification to blogs that support trackbacks. I have written the script below but it doesn't seem to work. I've tried it on some different blogs and it kept giving me a "403 Forbidden" error. Could someone take a look at the script below and tell me what I did wrong, please? $tb_url = "http://example.com/blog/post-name/trackback"; // tb URL for target post $tb_info = "url=" . urlencode("http://myblog.com/post-title") . "&title=" . urlencode("my post's title here") . "&blog_name=" . urlencode("my blog's name here") . "&excerpt=" . urlencode("quoted text from my post here"); $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, $tb_url); curl_setopt($ch, CURLOPT_HEADER, 1); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 0); curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 0); curl_setopt($ch, CURLOPT_POST, 1); curl_setopt($ch, CURLOPT_POSTFIELDS, $tb_info); curl_exec($ch); curl_close($ch); PHP: