some of it may be the breaking up of some botnets (some of the declines did correlate directly to high-profile breakups), but given that new botnets are being created, I wonder about that being the long term cause. I suspect that the profits from spam have been on the decline and the people who lost their spam botnets haven't bothered to replace them (or are concentrating on more targeted approaches rather than just blanket coverage)
it's gotten to the point where I don't bother with a spam filter on my home e-mail any longer, and I don't have more than a dozen or two spam messages in a day (out of 500-1000 messages a day this isn't significant)
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