Handle non 1x1 pixels

[martindufort]

What If the tracking pixel suddenly becomes an img<height=1, width=2> ?
At what point is this no longer a tracking pixel but a genuine image...

Should it look for an image less than X? Wondering.

[jochasinga]

Legit question (title changed for clarity) most pixels don't go over 1px because the point is to be invisible. More interesting case is when it catches something else, like a thin border image.

[ghost]

What if, instead of treating it only by size, the gmail proxy is also used as a strategy?

[jochasinga]

What if, instead of treating it only by size, the gmail proxy is also used as a strategy?

Could you elaborate?

[ghost]

Gmail currently passes the tracking through a proxy. Example: https://ci5.googleusercontent.com/proxy/l2xUKFGnNFKm64zEYmJhOcUmEJm15w9MC1txRRF01tpKlcL3t3O16aMJgbYQkucBySV0xV2T0EsCwikOAC0Z4em6uPzSs38lkHrYBvosRRAk14EfPoEXqC5JdLxRm8ToZmGSQqt_RwHCaBE_3uLgQDVEB05Rdtkq-Xzuw30=s0-d-e1-ft#https://www.example.com/tracking.php?order_id=1

Another example: https://github.com/OneClickLab/ugly-email-extension/blob/master/src/background.ts