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Marketing Glossary· Open Rate

What is Email Open Rate?

By Nikhil Sharma · Updated 1 November 2026 · Marketing Glossary
Definition

Open Rate is the percentage of delivered emails that recipients open — a basic measure of how well your subject lines and sender reputation earn attention in the inbox.

What is open rate?

Open rate = emails opened ÷ emails delivered, as a percentage. It has long been the headline email metric because it reflects whether your subject line and deliverability are working well enough to get the message seen at all.

A caveat: opens are less reliable now

Privacy features (notably Apple’s Mail Privacy Protection) pre-load images and inflate reported opens, so open rate is now a directional signal, not gospel. Judge trends rather than absolute numbers, and lean more on clicks and conversions.

What matters more

Click-through rate, replies and conversions tell you whether the email actually did its job. Strong open rates with weak CTR mean a tempting subject but a disappointing message. Use open rate to tune subject lines and send health; use downstream metrics to judge value.

Related terms
Email DeliverabilityCTRDrip CampaignMarketing AutomationPersonalization
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Written & reviewed by Nikhil Sharma
Founder, Fabulous Media
Nikhil has led growth for 850+ brands across 35 nations since 2008. Fabulous Media is an invitation-only growth agency that reports on pipeline and revenue, not vanity metrics. Meet the team · Request an invite.

Questions, answered

It varies widely by industry and list quality, but many sender benchmarks fall roughly in the 20-40% range. Because privacy features now inflate opens, treat open rate as a directional signal and focus on trends rather than a single target number.

Privacy features such as Apple's Mail Privacy Protection pre-load email images, which registers as an open even when the recipient didn't engage. This inflates reported open rates, so they're best read as trends, not exact figures.

Click-through rate, replies and conversions — they show whether the email actually drove action. A high open rate with low clicks means the subject line worked but the message didn't deliver.

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