That's a neat trick. After hearing about Mirapoint, I built a simple proof of concept that uses time-delayed redirects to gauge how long a user has attempted to

That's a neat trick. After hearing about Mirapoint, I built a simple proof of concept that uses time-delayed redirects to gauge how long a user has attempted to load an image: https://github.com/derwiki/redirect_tracker https://github.com/derwiki/redirect_tracker Like most email metrics, it's lacking -- but this is still -a little- more information, and that goes a long way in email marketing.