Why Is My Email Showing Opened When I Didn’t Open It?

You may notice in your campaign report that an email appears to have been opened by someone — including possibly yourself — even though you or they are certain they never actually opened it. This is a known limitation of how email open tracking works, and understanding the cause helps you interpret your open rate data more accurately.

How Email Open Tracking Works

Mailzzy tracks email opens by embedding a tiny, invisible image — often just one pixel in size — into the HTML of every campaign. This image is hosted on Mailzzy’s servers. When a recipient’s email client loads the email and renders the images, it sends a request to retrieve that tracking pixel. Mailzzy’s server records that request as an open.

This method has been standard across the email marketing industry for many years. It works reliably under normal conditions. However, a growing number of email clients and security tools now interact with emails in ways that trigger the tracking pixel without the recipient ever intentionally opening the message.

The Most Common Cause: Apple Mail Privacy Protection

In 2021, Apple introduced Mail Privacy Protection (MPP) in its Mail app across iPhone, iPad, and Mac devices. When MPP is active, Apple’s servers pre-fetch the content of emails — including tracking pixels — before the user opens the message. This is done to mask the recipient’s actual location and prevent senders from knowing when the email was opened.

The result: Mailzzy records an open for every email delivered to an Apple Mail user with MPP enabled, regardless of whether the recipient actually opened the message. For audiences with a significant share of Apple device users, this can inflate open rates substantially — sometimes by 20 to 40 percentage points.

Other Causes of False Opens

• Email security and spam filtering tools – Some corporate email security gateways and anti-spam services automatically scan the contents of incoming emails, including loading embedded images, to check for malicious content. This scan triggers the tracking pixel before the recipient sees the email.

• Email preview panes – In some email clients, hovering over or highlighting an email in the inbox preview pane can cause images to load, triggering an open event even if the recipient did not click to fully open the message.

• Link click pre-fetching – Some email clients or browsers pre-load linked content when the email is previewed, which can trigger both open and click events without deliberate action.

• Bot activity – Automated bots — including security bots operated by corporate IT infrastructure — may crawl email content and trigger opens. These are not human engagements.

What This Means for Your Open Rate Data

Because of Apple MPP and similar tools, open rate data across the industry is increasingly less reliable as an absolute measure of how many people actually read your emails. Treat your open rate as a directional indicator rather than a precise count.

For a more reliable measure of genuine engagement, pay closer attention to:

• Click-through rate – Clicks still require deliberate human action and are much less susceptible to automated inflation.

• Reply rate – Replies are an unambiguous signal of genuine engagement.

• Conversion tracking via Google Analytics – Tracking what happens after the click on your website gives you the clearest picture of real campaign impact.

• Trends over time – Compare open rate trends across campaigns to identify directional changes, rather than reading individual numbers as precise audience counts.

Can This Be Turned Off?

Mailzzy cannot disable Apple MPP or control how third-party security tools interact with your emails. The pixel-based open tracking method is an industry standard limitation. What you can do is adjust how you interpret open rate data and focus on click-based engagement metrics for the most reliable picture of campaign performance.