According to security firm Symantec, fewer spam emails are being sent now than at any time in the last 12 months.
It said that less than 50% of emails scanned during June were junk, which was the lowest percentage seen in over 10 years.
The latest figures show that cyber thieves are looking for ways to make money from people going online and the security firm said legal action against the criminal networks that pipe spam to people had helped to eliminate junk. The firm did say, however, that the fall in spam was as a result of a rise in malware.
In its latest monthly report in June this year, Symantec said only 49.7% of the billions of messages they monitor were spam, and since the report was issued, spam levels have declined further.
Over the last 10 months, UK police have been involved in the takedown of several separate botnets that appeared to funnel spam to victims.
Last month, however, Symantec said it had seen a significant rise in the amount of variants being produced, catching around 57.6 million individual pieces of malware, which is nearly double what it saw in April.
Symantec's Mr Nahorney said: "This increase in activity lends more evidence to the idea that, with the continued drops in email-based malicious activity, attackers are simply moving to other areas of the threat landscape."
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