On Sep 19, 2007, at 1:56 PM, John K Masters wrote:
Without wishing to start a conspiracy theory but has anyone collected
stats on the mail-agents used to send spam. Up till a couple of months
ago most were Outlook but since then I have seen a dramatic
increase in
the use of The Bat! to send spam. Obviously nothing to do with The
Bat!
becoming a Microsoft Trusted Partner in July this year.
I think most spam these days is sent using dedicated spam-spewing
software. For that reason, I would be careful about drawing any
conclusions from the agent headers. I suspect a lot of them are
faked in order to get better weighting in Bayesian filters and the
like. In the same vein, I sometimes see hotmail-specific headers in
spam that didn't ever touch a Hotmail server.
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