Verizon to Implement Spam Blocking Measures

February 18, 2009 – 8:22 AM is home to more than twice as many spam-spewing zombies as any other major Internet service provider in the United States, according to an analysis of the most recent data from anti-spam outfit Verizon, however, says it plans to put measures in place to prevent it from being used as a home to so many spammers.

Security Fix examined the latest stats from Spamhaus’s “composite block list,” (CBL) which relies on intelligence relayed by large spamtraps and e-mail infrastructures around the world. The list only is comprised of Internet addresses that have been observed to be sending spam, worms and viruses, or participating in other malicious activity.

Spamhaus currently includes 225,454 U.S. based Internet addresses on its CBL. Of those, nearly one-quarter — almost 56,000 — are assigned to Comcast, which according to Spamhaus is home to the next-largest concentration of malicious hosts among U.S. ISPs, has fewer than half as many listings.


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