It didn't work for me. That's why I asked for a refund. It's a shame, because the product is very promising. I use MailSuite with an annual subscription, and it would have been fantastic to have the option of replacing it with a lifetime plan. Unfortunately, my experience with GoEmailTracker has not been good. The mail opening notification didn't work at all from a Gmail message to an Hotmail inbox. I'm willing to reconsider and buy it back if the GoEmailTracker team can prove me wrong.