Trackbacks, also known as pingbacks, in WordPress are a great idea however they typically generate a lot of SPAM for little benefit. A trackback is generated within a post on your site by another bloggger linking to your WordPress article. Personally I disable the display of trackbacks in most WordPress sites however I still let the sites backend process trackbacks as it normally would. This means the person generating the trackback assumes that it functions properly and the WordPress site owner still receives notification via email of the trackback or pingback. Recently though my stance is changing to completely disable trackbacks on all posts and to go back and disable it in article that were previously published and disable trackbacks in those as well because the SPAM has been getting more intense over the past 6 months. Use the instructions below to disable trackbacks on your WordPress site.
It is easy to use your default WordPress admin interface to block comments from a certain domain. You can either have these comments require moderation or you can have the comments immediately marked as spam. My suggestion would be to initially have the comments require moderation just to make sure you are not also catching legit comments.
To block comments based on a certain domain follow the steps below.