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Most of these spams are coming from compromised windows machines which have been trojaned. Small mail and web servers are installed on these machines by automated means and then they become little spam sources with the ability to host spam sites.
For those that don't keep up with news, this widely distributed SPAM is propogated widely as hundreds of compromised machines are able to be commanded to deliver mail to portions of larger mailing lists. This makes it harder to shut down because to stop the spam requires a hundred or more spamming hosts to be shutdown not just one.
However, there is something very interesting happening in the deep background and soon (weeks to months) quite a few people who were previously thought to be reputable will be outed over this in a fairly dramatic way.
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