SpamAssassin Rule: WHOIS_NETSOLPR
Standard description: URL registered as a NetSol Private Registration
Domain names are extracted from any URL found the body of the mail and looked up, via DNS, using bl.open-whois.org. This lists domains that have been registered through services that allow private, or anonymous, registrations.
If the lookup returns 127.0.0.4 this indicates it was registered using Network Solutions Private Registration.
The default scores for this rule can be found in the online list of tests. This rule uses the URIDNSBL plugin.