Outlook read receipt gmail mobile2/19/2023 ![]() ![]() When you open the email newsletter, and it loads images (even if you can’t see any images), it loads an image with a unique address. These images are also known as “web beacons.” Each person who receives a copy of the email newsletter has a unique tracking image address in it. ![]() This is a tiny invisible image file that’s only a single pixel in size, also known as a 1×1 image. Companies that send email newsletters and other automated emails almost always include a special tracking image. ![]()
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