America Online, the world's largest electronic mail and Internet service provider, is bracing itself for attack. Its enemy, as the company publicly acknowledged this month, is a band of anonymous computer experts who have been evading AOL's security screens and sending unsolicited advertisements or offensive messages to many of its 11 million subscribers. The problem messages do not come from AOL subscribers. "We have always worked on the principle that AOL members will not abuse their own system," says the company's European spokeswoman, Rachel O'Neil. Those that do are likely to find themselves barred from the network.
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