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http://example.com/trackingimage.php?email={yourusername}@gmail.com http://example.com/trackingimage.php?email={yourusername}@gm... Or, if they snip the GET va

http://example.com/trackingimage.php?email={yourusername}@gmail.com http://example.com/trackingimage.php?email={yourusername}@gm... Or, if they snip the GET variable for whatever reason (I don't see them doing this): http://example.com/gmail/{yourusername}/trackingimage.php http://example.com/gmail/{yourusername}/trackingimage.php Or even: http://example.com/{emailidfromadatabase}/trackingimage.php http://example.com/{emailidfromadatabase}/trackingimage.php This tactic is already in use by most mass email companies.

dugmartin 13y ago
I'd imagine that they are going to de-dup the images they proxy which means email marketers need to generate unique images per mail and that means no more 1-pixel tracking images. A solution would be 1-pixel high tracking lines - a 1 x 128 pixel wide image that encoded 0 and 1 as two RGB colors adjacent to the mail's background color in the visual spectrum so the difference isn't noticeable would encode a sha-1 hash placed in the url. http://example.com/tracking-line/{hash}.png