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Comment by gsich | Hacker News Reader

>The solution is for newsletters to auto-unsubscribe users if they seem to stop interacting with the emails.

Not possible without tracking.

They aren't stripping query params off urls, so you can just add a recipient ID to any URLs in the email e.g.

    https://newsletter.com/linked-page?uid=7b32e2f7

That is ... not reliable tracking.

Works fine if you want to auto-unsubscribe recipients who don't interact with your emails.

Click tracking