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Outbound messages - Time period check. Most up-to-date viruses spread by e-mail and send themselves to addresses stored in Windows address book. This spreading has several typical symptoms - within a very short period of time, messages to a large number of addresses are sent, and additionally, these messages have the same subject and/or attachment. avast! monitors these symptoms and it can warn of them. You can find more information and possible settings on the page Heuristics - advanced.