> Here's a possible example. There are servers out there that return
> country codes of IP addresses. But what about a country code for a
> host name? You would have to do an IP lookup on the host and then
> use the IP to get a country code.
You shouldn't need a special DNS server to do that. If memory serves me,
a combination of Exim's `dnsdb' should do the trick and a bit of GeoIP
lookup [1] will probably give you what you need.
-JP
[1]:
http://jpmens.net/2007/08/28/e-mail-where-art-thou-from/