Quick answer: there are five reliable ways to know if someone opened your email: request a read receipt, install an email tracking Chrome extension, embed an HTML tracking pixel, use an email client with built-in tracking, or send through an email automation tool like lemlist. Each one works by detecting when the recipient's inbox loads a hidden tracking pixel. The catch in 2026: Apple Mail and Gmail now preload or block those pixels, so open tracking is no longer fully accurate. Pair it with reply rate, clicks, and meetings booked to see what is really happening.

Email open rate tracking is going through a tough time. 😢

First, Apple's Mail Privacy Protection started preloading every email, which inflates your email open rate by logging opens that never actually happened.

Then Gmail began hiding images, and the tracking pixel along with them, for senders it does not recognize or trust. That pushes open rates the other way and deflates them.

The honest takeaway: in 2026, open rate is no longer a number you can fully trust. Depending on the inbox provider, reported opens can swing well in either direction without your real performance changing at all.

Still, keeping an eye on your opens is worth it. A sudden drop is often the first sign of a deliverability problem. 👀

Here are 5 ways to check if someone opened your email, plus what to track once opens stop telling the full story:

A read receipt confirms that the recipient opened your email, though not necessarily that they read it.

When they open the message, a small pop-up asks them to confirm they have seen it. You get notified once they accept.

Read receipts are the most transparent option, since the recipient can clearly see you are tracking the open. That transparency cuts both ways: some people find the request intrusive and decline it, which leaves gaps in your data.

You can request a read receipt in most email clients, including Gmail and Outlook. In Gmail, you need a paid Workspace account to send read receipt requests.

Here's how to request a read receipt in Gmail:

And here's how to request a read receipt in Outlook:

For step-by-step instructions, read: How to request an email read receipt in Gmail and Outlook.

Best for: a handful of time-sensitive, one-to-one emails. If you are sending outreach at scale, you will want a method that does not ask every recipient to opt in.

Another simple way to track opens is a Chrome extension.

Most of these plug into Gmail, add a tracking pixel to your outgoing emails, and notify you the moment someone opens one.

Here are a few Chrome extensions that track email opens:

Extensions are convenient and cheaper than full automation tools. The trade-offs: they are not built for high sending volume, and some lesser-known providers ask for broad access to your inbox, which raises privacy questions. Check what an extension can access before you install it.

An HTML image tag can double as a tracking pixel.

If you are comfortable with a little code, adding one to your emails is straightforward. When the recipient opens the email, the image loads and sends you a notification, including the exact time the email was opened.

The useful part: the image tag does not have to be visible. These three variations all work invisibly:

If you go this route, respect your recipient's privacy and protect your own legal footing. Use end-to-end encryption, be upfront that you track opens, and limit yourself to relevant data like the open timestamp. Tracking someone's location, IP address, or device details crosses the line, and in many regions it breaks data protection rules like GDPR.

Some email clients add a tracking pixel to every email automatically, with no extension or code required.

Mailbird, for example, has built-in open tracking. You can switch it on for a single email, or use it on everything you send. No Chrome extensions, no frustrating afternoons battling to add code to your emails.

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Open tracking is not included in Mailbird's free plan.

The most scalable and hands-off way to track opens is an email automation or marketing tool.

That covers marketing platforms like Mailchimp, and outbound tools built for sales, like lemlist. You create a campaign, send it, and your open rate is tracked automatically across every recipient. No pixel-wrangling required.

Because open rates are no longer accurate, these numbers are a directional signal rather than a hard truth, and every method on this list shares that limit except the read receipt. The real advantage of an automation tool is everything that sits next to the open rate: reply rate, click rate, bounce rate, and meetings booked, all of which hold up far better than opens alone.

We put together a list of 5 email automation and marketing tools that track opens and the other metrics worth watching.

Open rates were always a rough proxy for whether a campaign was working. (Here's what open rates actually are if you want the full definition.)

Since open rate is no longer a metric to lean on, the fix is to track signals that are much harder to distort:

Stack these together and you reach a point where you do not really need the open rate anymore.

One last thing: the fact that open rates cannot be trusted is not a reason to neglect your deliverability.

You still cannot get a reply from an inbox you never land in. Even without reliable open data, every habit that drives a good open rate still applies: authentication (SPF, DKIM, DMARC), consistent email warm-up, and clean list hygiene.

Open rates still exist. You just cannot measure them precisely anymore.

Here are 5 ways to improve your email open rates.