This is factually incorrect. At least for the MSPs I use, they report the open time accurate to within a minute whether I'm using Gmail or not. I see no way fo

This is factually incorrect. At least for the MSPs I use, they report the open time accurate to within a minute whether I'm using Gmail or not. I see no way for them to do this besides tracking pixels embedded in the document, since I don't see any other outside resources.