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Old Dec 13, 2013 | 2:58 pm
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gfunkdave
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Originally Posted by Loren Pechtel
No. What Google is actually doing is cacheing those images on it's servers when the mail comes in. When you view the message you actually see what's on their server.

This only lets the sender know the message was received by Google, not that it was actually looked at.
Many such images have custom URL components unique for each user - if that particular URL is fetched then the marketer knows that that user's copy of the image has been requested.
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