Verizon to Implement Spam Blocking Measures - Security Fix: Via Washington Post

Verizon.net 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 Spamhaus.org. Verizon, however, says it plans to put measures in place to prevent it from being used as a home to so many spammers.

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Spamhaus currently includes 225,454 U.S. based Internet addresses on its CBL. Of those, nearly one-quarter -- almost 56,000 -- are assigned to Verizon.net. 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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Many ISPs have migrated customers away from Port 25 to sending and receiving e-mail on port 587, which - unlike Port 25 - requires the sender to authenticate him or herself with a username and password before it will permit the sending or relaying of e-mail.

Verizon spokesman Clifford Lee said within the next few months, the company plans to shift to using Port 587 for e-mail originating on the Verizon network.

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