Do you have any numbers on how much spam is sent from dial up or
dynamic nodes? I suspect that viruses are a bigger problem from those
sources.
This is just anecdotal, but perhaps 75% of my spam (until recently I was
getting around 120 spam/day) came from hijacked machines on broadband
connections. Very few virii came through, mostly just spam. FWIW, Comcast
customers seemed to be the most frequent sources. If Comcast had forced
these dynamic IP customers to use their smarthost and implemented rate
limiting, most of this spam never would have reached the outside world.
Those compromised machines then could been easily identified and cut off
from the outgoing mail server until they were secured. Apparently, Comcast
doesn't care enough about spam to do this, as long as their network is not
being spammed. Perhaps the people who control the trojans are smart enough
not to spam the same network a hijacked machine lives in so that they will
be left in place.
--
Seth Goodman
off-list replies to sethg [at] GoodmanAssociates [dot] com
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