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Spammers came out in force last month generating a deluge of unsolicited email that "severely threatened corporate networks", a monitoring report claimed today.
According to Postini's analysis of almost 70 billion emails from September to November, there was a 59 per cent spike in spam over the period.
The firm reported that unwanted email currently represents 91 per cent of all email, and that the daily volume of spam has risen by 120 per cent over the past 12 months.
Postini also reported a "dramatic increase" in overall email traffic, with 10 billion more communications in October than in September.