You just stop photos from automatically loading. When the email is opened, the email client loads the image and the tracker notices and sends a notification. Email trackers, like HubSpot’s tracker for sales people, work by embedding a tiny 1×1 image - just a pixel - into an email. However, there is an easy way to avoid being tracked.
It was very easy to see the politicians’ locations, down to specific hotels. During the 2016 presidential election, Merchant wrote, a security researcher sent emails with trackers to senators and people running for president, and found they didn’t have any anti-tracking. Some trackers can even obtain people’s IP addresses and pinpoint locations with accuracy, and this isn’t something that most people realize - even people who should take precautions.
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