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Once informed of the problem, representatives at Aflac said they began work to shut down the rogue spam source, but researchers said that the incident further illustrates the problems that many enterprises are still facing in battling spam.

As spammers have begun tapping into botnets controlled by other parties and found new methods for distributing their work via hijacked computers, the issue has only intensified, said Rick Wesson, chief executive of Support Analysis.

In the last month alone, Wesson's company has publicly detailed similar waves of spam emanating from a list of high-profile businesses, including 3M, AIG, and Thomson Financial, and the executive claims to have found similar campaigns coming from within blue chip companies, including Best Buy, HP, Intel, and Toshiba.

No matter how large the company and how much it has spent on anti-spam tools, he said, the issue remains a daily struggle.

"These companies are spending tons of money on security, but it shows that like some diseases within the human population, spam has become something that cannot be stamped out completely," said Wesson.

"Companies shouldn't be ashamed about talking about it because it is happening to ever...

"We expect this type of solid result throughout 2007, with strong results continuing through decade end," he said.

Hazlett rates the stock at "Outperform," with a price target of $65 per share.

Lilly shares climbed 47 cents to close at $58.87 on the New York Stock Exchange.

The stock peaked at $59.09.

Copyright 2007 Associated Press.

All rights reserved.

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