I have been looking at this trend and perhaps having another tool in our arsenal could help.
Can there be a header or a variable we can assign weight to for DNS?
A lot of spam houses have a DNS server and several that I checked were showing the same name server for their domains.
Just like a blacklist that looks at emails I wonder if it is efficient use of resources if one could also have a blacklist of DNS servers. This way we can add weight to certain servers.
This is an interesting idea. It's been added to the suggestion database. It would be a bit tricky to implement, but could be very useful (and would probably not require much extra in the way of resources).
-Scott
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