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I agree they could do it, but people upthread are suggesting that Google doesn't do that, and only loads the image when you open the message.

• Gepser 13y ago
  they could track if an email was opened twice first one = Google second one = user
  • ktsmith 13y ago
    I would imagine that google caches the images so there would be one request instead of two.
    • Gepser 13y ago
      you are right, I didn't think on that