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That's not true in fact...
You need to understand how works the MPP, actually:
1- if your phone has more than 80% of battery OR plugged in charge
2- AND you are using WIFI
3- AND you have MPP activated (96% of probability according to past studies)
THEN apple will download on a proxy server any single images from your incoming emails before downloading into the mail app:
It will then generates a "false" positive open tracking: you'll think that your email is more read than before... But that's not true
So, even if you investigate about the userAgent used on this open tracking in order to filter it out from your reports / aggregates, you will then also loose a lot of correct informations:
-> If I do not respect one of those points above (specially 1 or 2), it will generate an open tracking with correct date information when I opened the email...
So there are different solutions:
you can first calculate the average distinct open by excluding from your figures all people that recieved the email on iOS 15 and just make an average ratio from all others emails...
You can, and this is the actual correct practice, rely just on click rate and stop using open rate: instead of targetting people that open on the last 30 days, you'll target clickers from the last 6 monthes for example