MailTrackerBlocker

MailTrackerBlocker is a plugin and extension for the native Apple Mail application on macOS. It scans incoming HTML messages for embedded tracking elements such as read‑receipt pixels and other spy‑tracking code that marketers use to record when and where an email is opened. When a tracker is detected, the extension removes the remote‑content element before the message is rendered, allowing the user to view images and other media without exposing their activity.

The tool labels the source of each blocked tracker, listing a wide range of services that commonly employ such pixels, from email‑marketing platforms to analytics providers. By stripping these elements automatically, it eliminates the need to disable “load remote content” globally, preserving the visual fidelity of messages while protecting the user’s privacy.

MailTrackerBlocker is targeted at macOS users who rely on Apple Mail for daily correspondence and wish to prevent hidden tracking. It runs on macOS 10.11‑13.x as a plugin and on macOS 14.3+ as an extension, and is marked as a stable, core macOS component.