On Mon, 11 Apr 2011, Ramprasad wrote:

One of our clients has a purely local business and wants any mail coming
from a foreign domain to be given a score for spam

I would like to reduce the spam threshold , and then give a negative
score for every mail with sender domain in India

Is there a possibility of identifying the country where a domain is
registered. Identyfying by tld seems in-correct

It's also weak in the face of forgery.

Much more useful is identifying the countries where the MTAs are located. Take a look at the RelayCountry plugin.

--
 John Hardin KA7OHZ                    http://www.impsec.org/~jhardin/
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