This list aims to allow you to whitelist or blacklist mail from specific countries, or from certain routers (by AS number).
For example, if you wish to block all mail from the
For more information, see Sabri’s post to the NANOG mailing list, announcing resuscitation of the list, or click here visit the list’s website.
Note that while these lists may be used to block spam, they're not exactly spam-blocking lists. Rejecting all mail from China simply means that you're going to reject all mail from China, spam or non-spam. It's up to you to determine whether or not this is an acceptable compromise. I assume, like with users of korea.services.net, administrators who choose to use this list are fed up with spam from a certain country's servers, and receive little enough legitimate mail from a country that the risk of false positives is considered acceptable.