On Aug 15, 2007, at 12:16 PM, Fred Baker wrote:
in that context, here's one that one could use to dramatically
reduce spam intake.
That suggests a simple approach - in one's firewall, null route the
addresses reported by the reputation service as spam spews. It's a
network layer solution to an application layer problem, yes, and it
has all of the issues that reputation services have, and btw, you
still want to run spamassasin-or-whatever on what comes through.
Cisco IT tells me that it results in a dramatic reduction in spam,
however, and saves them serious numbers of monetary units.
The communication system isn't being a filter, properly speaking -
it is simply routing some traffic to black holes using standard
routing technology. And it doesn't relieve the application of the
burden of filtering. But it can help reduce the volume of crapola
at the application.
The early version of the "Realtime Black-hole list" published as a
BGP feed worked in the same manner. The current owners recognized
the need to reduce the burden on an email filtering. : )
-Doug
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