Guide to Apple Mail Privacy Protection (MPP) & iOS 18 (2025)

Apple's Mail Privacy Protection (MPP), introduced in 2021, is part of Apple's broader initiative to give users greater control over their data, particularly affecting email engagement metrics by anonymizing open tracking. As of 2025, iOS 18 introduces further changes, including AI-generated previews and new inbox categories, complicating how emails are noticed and tracked. MPP masks IP addresses and generates "machine opens," making open rates unreliable and necessitating a shift towards click-based metrics for measuring engagement. This has prompted email marketers to adapt by prioritizing clicks over opens, rethinking automation workflows, and utilizing new Apple-specific inbox features to maintain visibility. While MPP adoption varies across different email providers, its impact is more pronounced among users of Apple's own mail domains, forcing marketers to refine their strategies to navigate these privacy changes effectively.