PC World writes, "The dramatic fall in spam traffic reported last week after alleged rogue ISP McColo was taken offline will only be a temporary reprieve and could actually generate a new wave of Trojans, experts have warned.
ISPs disagree on the global percentage drop caused by the shuttering of California-based McColo last week, with estimates given by those contacted by Techworld ranging from 50 to 80 percent, but even the lower figure is still an unprecedented fall in such a short space of time. It appears that even those who were aware of its use as a hosting port had not guessed that a single ISP could be behind such a huge chunk of the world's spam.
"Our servers haven't been so relaxed for months," said Richard Cox, CIO of respected spam-fighting organisation, Spamhaus, ruefully. "This proves how important it is for the law to get at this sort of criminality.""