I was amused by a financial service I use that sent me a mail expressing concern that I wasn't opening their mail (which I had subscribed to). I was reading th

I was amused by a financial service I use that sent me a mail expressing concern that I wasn't opening their mail (which I had subscribed to). I was reading them all along. They just didn't know, and assumed I wasn't opening them. I was, but not the tracking pixel.