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And maybe just me but I doubt it - It leaves a REALLY bad taste in my mouth getting the alert that the email read receipt is being tracked.

this is so egregious to me i didn't realize email tracking like this existed.

It can be a useful tool in appropriate situations. It's not inherently bad.

It should always be opt in

What spam filters do these trigger? I have never seen any evidence of open tracking resulting in spam flags.

Same. Server side and client side seems to not care.

That's because you count them as part of that overwhelming "never opened" group.

Even those "image-based" opening trackers? I do agree that the 'confirm receipt' flag is not a good idea.

Block it.