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This feature uses a proxy method: Apple downloads all remote images for messages received on your Mac using a proxy method that also separates your IP address from the message. You can also get MailTrackerBlocker, a free extension for macOS Mail (already updated through macOS 13 Ventura) that blocks the best-known trackers.Īpple built a more comprehensive solution into Mail starting in iOS 15, iPadOS 15, and macOS 12 Monterey with Mail Privacy Protection. Some apps specifically look for and block those pixels, such as Postbox. If you don’t load images in your email app, the tracking pixels can’t perform their magic. Each time the message is forwarded or read, those instances can be logged as well with some marketing and mailing list software.Īs part of the ongoing cat-and-mouse game between privacy-forward companies like Apple and marketing firms and app makers that fail to garner advance permission for disclosing private information and personal decisions, these invisible tracking pixels are now largely blocked.

Third-party plug-ins and some marketing-oriented email hosts and apps can embed a consent-free tracking “bug”: a transparent 1-by-1–pixel image that, when rendered as part of an HTML message when images are loaded effectively reveals that the email message was read, at what time that occurred, and at what IP address, a loose way of identifying someone’s whereabouts on the internet. Outlook lets you request a read receipt but few modern email clients will honor that request at all or by default.