The botnet’s output has risen sharply, according to a new report.

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While the average size of spam email might have decreased, February saw a general rise of global spam.

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Computer scientists have revealed a cunning new method earlier this year that could be used to block almost all of the most common sort of spam from botnets.

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Symantec has warned users of the Cutwail botnet, which is sent via business-related messages and seeks to exploit computer weaknesses to gather information.

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