Mail Privacy Protection (MPP)

An Apple Mail feature that preloads remote content, including tracking pixels, making email open rates unreliable for users who enable it.

By Brandon MinaCEO, BrandPilot AIUpdated November 2026

Short answer

Mail Privacy Protection (MPP) is an Apple Mail feature that preloads remote content, including tracking pixels, and hides the user's IP address. Because emails can register as opened without being read, open rates become unreliable for users who enable it. Marketers have shifted toward clicks, conversions and other engagement signals instead.