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They generate a unique image for each email and track when the image has been accessed. As others have mentioned, many email clients automatically block image
by anthony_franco 16y ago
They generate a unique image for each email and track when the image has been accessed.
As others have mentioned, many email clients automatically block image downloads by default. So this way of tracking, at first glance, seems pretty limited.
- NathanKP 16y agoRight. I was trying to think of clever tricks to get around image blocking. Some techniques, such as list-style-image look like they can get around most email services.