On Mon, 22 Oct 2007 11:30:27 CDT, Al Iverson said: > I log only valid domains used as the PRA or MFROM in the spam I > receive, about 10k/day. Counting valid domains only, each domain is > only seen on about three different spams, when averaged out. That's a > hell of a lot of domains that actually exist, and I think a more > accurate assumption is that a significant nonzero amount of that > backscatter does actually reach a recipient mailbox on the other end.
It would be interesting to know how your numbers get changed if you look for stuff sent with "domain tasting" domains. Sure, it was a valid domain - for all of 48 hours before it got returned because it was starting to "taste bad"....
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