From a peak of around 25,000 mail drops per month in the backscatter I was getting from the .ru domain to the non-existent address “firstname.lastname@example.org” I am now seeing virtually none. My logs show a distinct drop off from mid to late December last year to about 10-15 emails per day (when I had previously been seeing anywhere between 600 and 900 per day). Since then the trickle has slowed to a crawl. I now receive only a handful a week, with most days being completely clear.
I wonder where they have gone.