16. 16@SparkPost
But it’s bad!
It relies on images so is really inconsistent
Unique opens generally worked out by IP but that gets broken
by image caching and IP address sharing, and by everyone
having multiple devices or changing location often
Gmail clipping stops pixels at the bottom from rendering
And that doesn’t cover privacy concerns, tracking blockers etc
23. 23@SparkPost
But
Technical solutions are hard
Everyone else just uses open rates so why shouldn’t we
What’s the point of better metrics if nothing will change
internally anyway