All those junk e-mail messages may promise instant wealth, but they can be quite painful to the bottom line.
A study to be released this week attempts to quantify the annual cost of spam: $8.9 billion for U.S. corporations, $2.5 billion for European businesses and another $500 million for U.S. and European service providers.
Marten Nelson, an analyst at Ferris Research, says that while most spam can be deleted in one second, occasionally someone is duped into clicking the message. It also takes time to track down legitimate messages mistakenly tossed by inaccurate spam filters.

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