If your open rate jumped in the last few years and you cannot explain why, it is not because people suddenly started reading you. It is because Apple started opening the mail for them.

What Apple actually does

In 2021, Apple shipped Mail Privacy Protection on iPhone, iPad and Mac. When someone uses Apple Mail with that setting on (and most people leave it on), Apple fetches your message on their servers before the person ever looks at it.

That fetch includes the tiny tracking image most email tools use to count an “open.” Apple loads the image. Your tool records an open. The person may never have seen the subject line.

Apple Mail is a large share of consumer email. So a number that used to mean “someone looked at this” now means “Apple’s proxy saw this.” The two are not the same.

Gmail, Outlook and others have been blurring the same signal for years, in smaller ways: image blocking, prefetch, security scanners that hit every link and pixel. Apple just made the lie too big to ignore.

Why the number still looks useful

Open rate is easy. It moves. Dashboards put it first. After a send you can watch it climb for an hour and feel like the work landed.

It also flatters you. Privacy Protection inflates the rate, often by a lot. A list that used to open at 28% can show 45% without a single extra reader. Tools that still lead with that figure are selling you a story about engagement you did not earn.

None of this means your email is worse. It means the yardstick broke.

What still tells the truth

Clicks still need a person. Someone has to tap a link. Prefetch can inflate those too, since some corporate scanners hit every URL, but a real click-through rate, especially to a page you control, is in a different league from opens.

Replies are better still. If you ask a question and people write back, you have proof a human was there.

Unsubscribes are a signal, not a failure. A quiet list that never unsubscribes is often a list that never reads you. A small, honest drop after a send is how a list stays clean.

The numbers that pay the bills are the ones tied to the reason you send: a sale, a booking, a signup, a click through to the thing you actually wanted them to see. Those never lived in the open rate. They were always a step further on.

What to do with this week’s campaign

Stop using open rate to decide who is “engaged.” A segment of “opened in the last 90 days” on a list full of iPhones is mostly a segment of people whose mail was prefetched.

If you need a proxy for attention, use clicks across the last few sends, or replies, or a page they visited after the email. It will be a smaller number. It will be a real one.

When a tool shows you an open rate, it should say that the figure is unreliable. Drop does. The number is still there, because people ask for it, and because a sudden crash can still mean a deliverability problem. It is not how you judge the writing.

Write the next email as if nobody will open it unless the subject line and the first sentence earn it. That was always the job. The dashboard just stopped pretending otherwise.