Sorry, forgot to say the other things:
SAProxy 2.5 is the current version
http://www.statalabs.com/
It filters incoming email by checking for missing headers and various other things that work by a point system, a missing thing in the header or some false information is worth a certain amount of points, and if that email gets enough points it is renamed to something so you don't have to deal with it.
The version I seek, as mentioned earlier, is 2.1 and I have searched and searched with no luck.