22 Oct
2007
22 Oct
'07
5:26 p.m.
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"....