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Administrators at Avnet have started stripping certain embedded image files out of all messages, after seeing an uptick in
image-based spam two months ago, said Rob Kudray, manager of messaging services with the computer distributor.
One other tactic that is helping keep inboxes full is the spammers' practice of constantly registering new domains. Of the
35 million domains registered in April, 32 million were never paid for and expired after five days, Sprosts said. He believes
that many of those domains were used by spammers to send out their unsolicited e-mail during that five-day grace period.
This technique makes it very difficult to blacklist e-mail based on the URLs it contains. "Traditional blacklists and whitelist
approaches just can't keep up with how fast they're registering new domains and changing the URLs in the e-mail," Sprosts
said.
The IDG News Service is a Network World affiliate.
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