Unsolicited e-mail made up 90.4 percent of messages on corporate networks last month. That represents a 5.1 percent increase over last month’s numbers. Nearly 58 percent of spam is now coming from so-called botnets, according to Symantec. The worst of the spamming botnets — called Donbot — generates 18.2 percent of all spam, the company says. Social networks are also becoming an increasingly important spammer’s tool, security experts say.”]
Source: https://www.csoonline.com/article/2124018/90-percent-of-e-mail-spam–symantec-says.html