Out of curiosity (as this is a feature that I would like to have as well for
a couple of speficic countries), is there a reason that a couple of SA
plugins cant be used:

http://wiki.apache.org/spamassassin/URICountryPlugin
Or
http://wiki.apache.org/spamassassin/RelayCountryPlugin

I am not certain which of these would be the correct one to implement.

- Skip