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The ISPs will submit lists to Spamhaus, which will push them out to those that use its list to block spam, including businesses such as Sophos and Microsoft.

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"It's an arms race with spammers," Linford said. "It [the PBL] will certainly be an extremely good weapon."

But he's not sure for how long. "Obviously, by this time next year, the spammers will have found a way around it," Linford said.

The IDG News Service is a Network World affiliate.