They actually used an RDNS blocker (as a hard test) last week, with predictable results:Even more interesting is the inaccuracies of the article:
http://zdnet.com.com/2100-1105-982118.html
The irony, of course, is how much spam comes FROM WorldNet IPs.
"Every IP address maps to a domain name" (if this were the case, reverse DNS lookups wouldn't be useful).
"depending on the architecture of the network--whether a server answers to multiple domain names--the mapping may or may not go through" (not true -- either the reverse DNS entry exists, or it doesn't -- the "mapping" doesn't go through if the mapping doesn't exist).
"many spammers use fake IP addresses to deliver commercial messages" (I still haven't found a single spammer that used a fake IP address).
And, the article keeps talking about how AT&T implemented this test, and then disabled it because of the FPs -- but, it keeps talking about how AT&T is going to implement the test again! That just doesn't seem to make sense. Why disable it now if they are going to re-enable it?
-Scott
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