Cool Solutions

Junk-mail Blocking by Country


January 23, 2007 3:58 am






A Forum reader recently asked:

“I would like to know more about country level RBLs. Can you direct me to
any references?”

And here’s the response from Michael Bell …


You can block everything coming from a particular country by using Country-specific DNSBL Providers. These DNSBL providers list IP addresses of specific countries. The net-effect is that you can block e-mail session attempts per-country by using these DNSBL providers. This can be a very convenient and efficient way of blocking email from countries that you knowingly would never communicate with. A full description of this service can be found at:

The hostnames used for these DNS zones are based on the the International Organization for Standardization (ISO) geographical coding standard ISO 3166. The two letter coding standard as described in the ISO 3166-1 subset is used as the basis to identify these country-based DNSBLs.
Use these DNSBL providers at your own risk.

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Disclaimer: This content is not supported by Micro Focus. It was contributed by a community member and is published "as is." It seems to have worked for at least one person, and might work for you. But please be sure to test it thoroughly before using it in a production environment.