It had to happen sooner or later. There has been a rush of trackback spam on blogs hosted at supersized.org. As it lies in the nature of trackbacks to be submitted automatically, by a machine, the sophisticated anti-spam mechanisms that work so well for normal user-comments can not be applied.
I have therefore deactivated trackback-comments for all blogs on supersized.org, except for those, who have changed the settings for comments submitted via the API. Their setting is now "moderate" which means they receive an email for each trackback that has been made. The trackback won't appear on your blog until you have allowed it to be displayed.
Sorry for "removing" the trackback feature, but I assume you don't want to have 300 emails a day that contain a moderation request for trackback spam.
If you want to cope with that and enable your visitors to submit trackbacks, blog-configuration page, click "Configure Plugins", scroll down and select the "Spam protector" plugin and adjust the "How to treat comments made via APIs" setting.
UPDATE:
To make things clear, some more words. Only "incoming" trackbacks have been blocked. If you write an entry and reference another website or blog-entry, your supersized-blog will still send out trackbacks and announce entries on blog-syndication sites (if you want it to).
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