CSPAM, Three Strikes 1.1 and Three Strikes 1.2 Alpha have been updated to check for trackback spam. Please download them again to get the updated versions. Nothing special to be done, just replace your existing plugins.
The CSPAM plugin can be downloaded from the same link as has been privately provided to you through email. I take this opportunity to promote it again. If you would like to participate in the CSPAM project, please email me or leave a comment and I will send you the download link for the plugin.
Please report bugs.