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Apple MPP Skewing Opens? — Mail Privacy Protection prefetching makes data unreliable. Learn Solutions →

How does MPP caching bias engagement data?

Apple Mail Privacy Protection prefetches and caches all images from Apple servers. This causes nearly every message sent to Apple Mail users to register as opened.

MPP creates inflated open rates, artificial engagement patterns, and misleading device statistics. It hides the true behavior of the subscriber behind Apple’s protective shield.

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