Engagement Segments: Opens vs Clicks vs Purchases

An open is not engagement. A click is barely engagement. A purchase is the only signal that cannot be faked by a mail app, and segments built on opens are lying to you.

Engagement segments should be built on clicks and purchases, not opens. Apple's Mail Privacy Protection inflates open rates by loading images automatically, so open-based segments mix real readers with bots. Clicks show intent, purchases show commitment, and the segment should weight them in that order.

The open is dead as a signal

An open used to mean a subscriber read the email. Apple's Mail Privacy Protection changed that by loading tracking images automatically, which registers an open whether or not a human ever saw the message. The open rate went up, and the signal went down, because the opens now include every mail app that loads images in the background. A segment built on opens is a segment built on a signal that no longer measures what it claims to measure.

The damage is not just in the numbers. A segment that treats an open as engagement will mail subscribers who never read anything, and those subscribers will complain, unsubscribe, or mark the mail as spam. The complaint rates tell the story: active lists run 0.01 to 0.03 percent, 90 to 180 day inactive lists run 0.1 to 0.5 percent, and 180 to 365 day inactive lists run 0.5 to 2 percent. Gmail and Yahoo enforce a 0.10 percent complaint ceiling, and a list that crosses it gets filtered. An open-based segment is a deliverability problem in disguise.

Related reading on this site: SegmentSage and Win-Back Flows: The 90-Day Silence Rule cover the neighbouring problems in more depth.

Clicks are intent, purchases are proof

A click requires the subscriber to act, and it cannot be faked by a mail app loading an image. A click on a product link is a signal of intent: the subscriber saw something they wanted and acted on it. A click on a category link is a weaker signal, but it is still a signal. The click is the first honest engagement metric left after Mail Privacy Protection, and it is the one the segment should be built on.

A purchase is stronger still, because it proves the subscriber is a buyer, not just a reader. A subscriber who clicked and bought is the most engaged subscriber on the list, and they should get the most email, not the least. A subscriber who clicked and did not buy is a warm lead, and they should get a different message. A subscriber who never clicked is a cold subscriber, and they should get less email, not more. The segment should weight the signals in that order: purchases first, clicks second, opens not at all.

Rebuilding the tiers on honest signals

Three tiers work for most lists: buyers in the last 90 days, clickers who have not bought, and everyone else. Each tier gets its own cadence and its own content, because the three groups need different things. Buyers get product updates and early access. Clickers get the offer that closes the sale. Everyone else gets less email, and a re-engagement campaign when they approach the sunset threshold.

The rebuild is a one-time job, and it pays for itself in deliverability. A list that mails only the engaged subscribers will see its complaint rate fall, its open rate rise, and its revenue per email climb. The list will also get smaller, because the cold subscribers will be suppressed, and that is the point. A smaller engaged list beats a large dead one, because the large dead one is a tax on the sender reputation that the engaged subscribers pay for.

Frequently asked questions

Should I segment by email opens?

Not anymore. Apple's Mail Privacy Protection loads tracking images automatically, which inflates open rates with false opens. An open-based segment now mixes real readers with mail apps, and campaigns built on it target the wrong people.

What is a better engagement signal than opens?

Clicks. A click requires the subscriber to act, and it cannot be faked by a mail app loading an image. Purchases are stronger still: they prove the subscriber is a buyer, not just a reader.

How should I tier engagement segments?

Three tiers work for most lists: buyers in the last 90 days, clickers who have not bought, and everyone else. Each tier gets its own cadence and its own content, because the three groups need different things from you.

Does engagement segmentation affect deliverability?

Yes, directly. Mailing inactive subscribers raises complaint rates: active lists run 0.01 to 0.03 percent, 90 to 180 day inactive lists run 0.1 to 0.5 percent, and 180 to 365 day inactive lists run 0.5 to 2 percent. Gmail and Yahoo enforce a 0.10 percent complaint ceiling.