On Friday, April 22, 2005, 7:27:17 AM, John Delisle wrote: > Even if data re average age of the domains, wouldn't they just start > registering them earlier so as to not match that pattern?
Yeah that's always a possibility. But there seems to be some evidence that a lot of spam domains don't get registered for more than a year and that many are used shortly after they're registered. For example Outblaze looks at registrations fresher than 90 days old in their SURBL listings. And if some spammers used older domains then we'd use other ways to find those, or not exclude them based on age of registration. In that sense it's a cat and mouse game, but nonetheless, many spam domains use recent registrations. Jeff C. -- "If it appears in hams, then don't list it."
