wichert
Joined 12 years ago
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Member since
Mar 31
[ my public key: https://keybase.io/wichert; my proof: https://keybase.io/wichert/sigs/HI51a4FpFSXsgKk58yS-a641jetIG13aVpkp0_KzAc8 ]
View on Hacker NewsJoined 12 years ago
But they can track proxy metrics for this. For example people using GMail's builtin unsubscribe feature more than once with the same unsubscribe link for different emails is a pretty good indicator the unsubscribe did not work.
[1] http://zserio.org/doc/ZserioLanguageOverview.html#bit-field-...
[0] https://en.wikipedia.org/wiki/WISPr [1] https://github.com/wichert/wispr