Most people do not realize that the majority of marketing emails contain invisible tracking pixels -- tiny 1x1 images that report back to the sender when you open the email, revealing your location, device, and the time you read it.

How Spy Pixels Work

When you open an email containing a tracking pixel, your email client loads the tiny image from a remote server. This request transmits your IP address (revealing approximate location), your device and email client information, and the exact time you opened the email. Some tracking pixels are loaded multiple times, allowing senders to know how many times you re-read a message.

Why This Matters

Tracking pixels are embedded without consent or disclosure. They operate invisibly and provide senders with information that most people would consider private. When did you read their email? Where were you? What device were you using?

For individual senders using email tracking in sales or recruiting, this creates a power imbalance. The sender knows exactly when you read their email and may follow up based on that knowledge.

For marketing emails, tracking pixels feed into larger data profiles. Combined with other tracking data, they help build detailed pictures of individual behavior patterns.

How to Protect Yourself

Disable remote image loading. Most email clients allow you to prevent automatic loading of remote images. This blocks tracking pixels but also blocks legitimate images until you manually choose to load them.

Use privacy-focused email clients. Some email clients (like Apple Mail with Mail Privacy Protection in iOS 15+) automatically proxy remote images, preventing senders from obtaining your IP address or knowing when you opened the email.

Use ProtonMail or Fastmail. These privacy-focused email providers offer built-in protections against tracking pixels.

For Email Senders

If you send marketing emails or newsletters, consider whether tracking opens is genuinely necessary for your business. Many privacy-conscious companies have disabled open tracking entirely, relying on click metrics and direct engagement instead.

Removing tracking pixels from your emails demonstrates respect for your subscribers' privacy and aligns with the growing expectation that companies should minimize unnecessary data collection.