Display images from certain senders - Gmail Help - 1 views
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to help protect your privacy; if we displayed the images automatically, it could potentially allow the sender of the email to see that the images are being fetched, and therefore know when you’ve read their message.
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But, if someone you've sent email at least twice sends you a message with images in it, you’ll see the image by default
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We'll only show images in messages that are authenticated, so you won't have to worry about seeing images in messages where the sender's name or address is spoofed.