Global spam has increased in 2016
The recent Cisco 2017 Annual Cybersecurity Report suggests that spam accounted for 65 percent of the total email volume in 2016. A review of statistical data from the last ten years shows that 2016 spam volume is close to the record levels seen in 2010. The volume is growing due to an increasing number of spam-sending botnets. According to Cisco threat researchers, about 8-10 percent the spam observed in 2016 could be classified as malicious.