Note: this list hasn't been updated for a long time. On the other hand, I still see quite a number of search engine hits for several of the spammers I mention here so it might be very well the case that they are still active.
Read the rest of Spam sending domains.
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Just thought I would tell you that you are giving these spammers traffic by listing them on a page can be accessed by engine spiders, not to mention it could hurt your own ranking. Far as cluelessness, if perhaps you'd include a page describing how to change the default settings of the most common antivirus server software, I would feel considerably inclined to do so.