A single tracking pixel is embedded into the email, usually (but not always) hidden within an image
Most email-tracking programs use something called pixel tracking.
... article in today's New York Times - "Ways to Avoid Email Tracking". I want to do this, but the article was not specific enough to Mail to explain ...
How to block tracking pixels · macOS Mail app: go to Mail>Preferences>Viewing and uncheck “Load remote content in messages.” · iOS's Mail ...
You can add HTML img tags (linking to your tracking pixel) by manually editing your Mail.app email signature files. Of course these will only ...
Email tracking is a basic but effective tool of surveillance that has taken over most inboxes. It typically employs a tiny pixel image attached to ...
Gmail on Android; Apple Mail on iPhone
I knew this because I was running the email tracking service Streak, which
A tracker and spy pixel blocker plugin for macOS Apple Mail.
They can also be used for email tracking.