Answers Trickle Out as Spammer Networks Remain Compromised

At about 4:30 p.m. Eastern time last Tuesday, the volume of junk e-mail arriving at inboxes around the world suddenly plummeted by about 65 percent. Confronted with information that one Silicon Valley computer firm was hosting organizations that controlled the distribution of much of the world’s spam, Internet service providers pulled the plug and McColo Corp., the hosting firm, went dark.By most accounts, the volume of spam has remained at far diminished levels, though experts say they expect spam to soon bounce back, or even exceed previous levels. But the question remains: How could such a massive concentration of spam activity be hosted for so long by servers at a single U.S.-based facility, in the belly of the security and tech community in Silicon Valley?

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