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Blocking Email from certain countries

I have a 2003 r2 server with exchange 2003.  I want to block email from certain countries. I am assuming I open exchange manager / global settings / message delivery properties / connection filtering and enter a range.  But where can I find a conprehensive list of ip ranges for different countries.  I have been trying google, but I cannot seem to find any actual lists.  Also, is there a better method for performing this?
2 Solutions
Why not block them on your AV/Spam appliance?  If you block them before they get into the Exchange environment, than all the better if that is your reasoning.  To remain neutral, IANAs ccTLD codes are taken directly from the standard country abbreviations maintained by the International Organization for Standardization (ISO) in ISO standard 3166-1. When a country is recognized by the ISO and a code assigned to it on this list, IANA creates it as a top-level domain. There are presently over 200 different geopolitical TLDs. Please see here to find the countries of your concern. http://www.iana.org/domains/root/db/
If you block through the appliance, you can block using wildcards ending in the country of origin.  Blocking by IP would be better served as an ACL rule with your firewall folks.
If you think this will be an effective antispam measure, then you need to think again.
More spam originates from the USA than any other country.

If you insist, I would look at some of the blacklist operators. They have country based blacklists that you can use, which will save you the hassle of maintaining lists yourself. Do consider though that not all email originates from where you expect. I worked for a  while for a company here in the UK, where all of my email actually hit the internet from a server in South Africa, despite me having a co.uk address.


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