Here at work, we've invested in something called Mimecast, I think it manages our email traffic. Amongst other things it does is, once a day, it sends me an email with an inventory of what it has diagnosed as potentially junk email for me to white-list, black-list or otherwise.
I tend to delete the email.
We also have something called Zscaler, (or Zslacker, as I prefer to call it) which amongst other things, monitors the appropriatness of sites I visit. As of a couple of days ago Zslacker has started to put the Mimecast email into my junk mail.
Isn't this how Skynet started?