Kaspersky Security Bulletin. Spam and phishing in 2015

In 2015, the proportion of spam in email traffic decreased by 11.48 percentage points and accounted for 55.28%. The largest decline was observed in the first quarter; from April the fluctuations stabilized and were within a few percentage points. This reduction was caused by the migration of advertising for legal goods and services from spam flows to more convenient and legal platforms, as well as by the expansion of the "gray" zone in mass mailings.