Hello, we have noticed a change in the last few weeks in how Mail Privacy Protection (MPP) is operating. Specifically, MPP pre-caches images within email newsletters that are protected via Private Relay. The end result of the pre-cacheing is that every image in the newsletter is retrieved from our servers even if the user does not open the newsletter. This has been in place since '21.
What we've noticed in the last month or so, is that the amount of pre-cacheing has dropped significantly, on the order of 20-25%. We can compare this with newsletters opened in non-MPP environments to know that email sends are consistent, it is only that pre-cached events seem to have changed.
Does anyone know of any changes to the logic of Private Relay / MPP that would impact how it is pre-caching data from email newsletters?
Thank you.
