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.
...at the cost of dropping legitimate traffic. the thing is, the set of
valid senders for you and the set of valid senders for everyone at cisco
is very different, and the latter set is much fuzzier. and those
reputation services won't take responsibility for the mail that you lose
by trusting them, nor are they accountable to the senders either.
this is not a way to make the network more robust.
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