noxion

In your functions.php insert this:

function leads_integration_wp_cf7( $cf7 ) {
       $url = your_url_goes_here;
       $postparams = your_post_params_goes_here;

       $ch = curl_init($url);
       curl_setopt($ch, CURLOPT_POSTFIELDS, $postparams);
       curl_setopt($ch, CURLOPT_POST, 1);
       curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1 );
       curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1 );
       $output = curl_exec($ch);
       curl_close($ch);
}
add_action('wpcf7_mail_sent', 'leads_integration_wp_cf7');

You have to add this code bellow, for example:

[please read http://codex.ww.wp.xz.cn/Forum_Welcome#Posting_Code for posting code]

function my_wp_admin_css() {
 echo '<link rel="stylesheet" type="text/css" href="' .get_bloginfo('template_url').'/wp-admin.css">';
}

add_action('wp_admin_css','my_wp_admin_css');
apply_filters( 'wp_admin_css','my_wp_admin_css' );

Note that I’ve put the action too. I think that is something broken. So this is the workaround. =)