As Apple said, "MPP hides your #IP address, so senders can’t link it to your other online activity or determine your location. It prevents senders from seeing if and when you’ve opened their email." To put it bluntly - if this function is enabled, your ESP sees your email as opened, even though your prospect may have never seen and read it. It has been done by a special Apple tracking pixel. Apparently, such a feature has created lots of new challenges for email marketers as the metrics they used to build their mailing campaigns’ analytics on are no longer that much useful. And the email world had to adapt and find the way out. We’ve gathered all the information and expertise and put it into one handbook for you to get fully covered on all the aspects to make your Apple mailing campaigns a blast.