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You can't tell if an image is a 1x1 pixel until you load it from the server. At that point, the pixel has already done its job. Most email clients these days d

You can't tell if an image is a 1x1 pixel until you load it from the server. At that point, the pixel has already done its job. Most email clients these days don't block images by default unless it ends up in the spam mailbox. They never embed images directly into emails either.

benjymo 7y ago
At least Thunderbird and Outlook on Mac block images by default and you can whitelist people from your address book.