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Internet registries. ARIN hands out addresses for North America, a portion of the Caribbean and sub-Saharan Afric (strange, isn't it?); RIPE handles Europe, the Middle East and parts of Africa and Asia; LACNIC is Latin America and the rest of the Caribbean; and APNIC is the Asia Pacific region.

A lot of spam comes from overseas. If you don't care about getting email from certain countries, you can identify the IP range those countries use and block everything from that range. It's drastic, but may be useful. Keep in mind that this would also block legitimate email, so don't rush into a decision like this.

You can find on line resources like this listing of APNIC ranges: http://www.apnic.net/db/ranges.html and this http://ip-to-country.webhosting.info/node/view/239

Thanks to Bob Meyers for the suggestion.

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