> You're supposed to stop sending emails to someone who's not interacting with them, or you get an extra point towards being flagged as spam. It's a bit more c

> You're supposed to stop sending emails to someone who's not interacting with them, or you get an extra point towards being flagged as spam. It's a bit more complicated than that. There are many reasons why a pixel may not fire but the email is still read, and there are many ways pixels can record false positives. Relying on email opens is really not a good measure of engagement. Sadly, inbox placement is almost impossible to measure without email open tracking as feedback loops from gmail/hotmail/etc are just not good enough.