The old pump-and-dump spam scam, which at one point accounted for half of all unsolicited email, has plummeted to just five per cent this month, according to email security firm Marshal.
Pump-and-dump spam levels have averaged around 30 per cent but in the last four weeks of the quarter, however, the Marshal Threat Research and Content Engineering team observed a "rapid decline" in the volume of stock spam to the lowest point in 10 months.
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