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MarTech » Customer & Digital Experience » Study finds iOS 15 is inflating email open rates

Study finds iOS 15 is inflating email open rates

Mail Privacy Protection feature marks emails as opened whether or not a person looks at them

Constantine von Hoffman on March 16, 2022 at 12:13 pm

Apple’s new Mail Privacy Protection (MPP) is having a significant impact on email marketing, according to a new study from Campaign Monitor that found that average open rates were up 3.5% year-over-year in 2021, while click-to-open rates were down 3.6%.

Released last year as part of Apple’s iOS 15, MPP is an opt-in feature that essentially blocks email senders from being able to see information on how those users interact with emails. It does this by pre-fetching/downloading an email and its images (including tracking pixels). This marks the email as opened, artificially inflating open rates for each user that has opted in to the new feature. 


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The study found that open rates increased by more than 10% between June 30, when iOS 15 went into its public beta release, and the end of the year.

Why we care: This is further evidence that open rates are, at best, a questionable KPI. Even before this there were very real questions about the use of a metric that had no connection to engagement. Someone who opens an email and immediately trashes it is counted the same as someone who opens it and then clicks through to an offering.


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About The Author

Constantine von Hoffman
Constantine von Hoffman is managing editor of MarTech. A veteran journalist, Con has covered business, finance, marketing and tech for CBSNews.com, Brandweek, CMO, and Inc. He has been city editor of the Boston Herald, news producer at NPR, and has written for Harvard Business Review, Boston Magazine, Sierra, and many other publications. He has also been a professional stand-up comedian, given talks at anime and gaming conventions on everything from My Neighbor Totoro to the history of dice and boardgames, and is author of the magical realist novel John Henry the Revelator. He lives in Boston with his wife, Jennifer, and either too many or too few dogs.

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