You know I've never had a problem with linking because of opening an email.
But then all I use is Gmail for eBay/PayPal which blocks tracking images by default.
I do know there are tracking pixels within each email which can tell a lot about you, for example your IP Address. But as long as you have images blocked, you'll be fine.
You do bring up a good point about replying to an email and passing on tracking images. But it's not like you're passing a cookie along.. you're just sending the tracking code to a user, which will load on their PC and become tracked by eBay.. nothing big.
To add more to this, some say when eBay reads your IP Addrress with the tracking pixel, if you have any eBay cookies on your machine, they're picked up as well. No cookies are put on your machine, they're just read. I'm not sure about this, but it does make some sense.
Regardless I use Gmail (images disabled by default) so there are no issues for me.
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