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Re:Ubiquiti Networks Breach by berkes on Tuesday January 12, 2021 @02:54AM (#25743658)
In this case it's both tracking and a legitimate feature: being able to place unsubscribe links in the "web version".

I'd argue that this feature is not worth the privacy invasion, but for it to work, you do need a secret in the URL that is always personal.

Re:Ubiquiti Networks Breach by sundvor on Friday January 15, 2021 @05:36AM (#25789207)
They could easily have left the unsubscribe in the email, and linked to a UID of the mass mailout text instead for the web view.