I tallied up my spam counts for the last 20 months (Jan 2015 through Aug 2016) to one of my most spammed at email addresses and plotted this simple graph. Incoming spam seems to be on a sharp decline over the last year. The high was over 2000 messages in August 2015 and the low of under 50 for the most recent month, August 2016. That’s from nearly 70 a day to less then 2 a day!
All the first ten months of the data were higher then all of the last ten months. I can’t correlate this drop with any configuration change on the server. This leaves me wondering if spam has finally moved onto social media and other delivery methods and given up on email.