That's rather ridiculous. There's a good reason not to put a one-click unsubscribe button in the email (email scanners will GET every URL you link to check for

That's rather ridiculous. There's a good reason not to put a one-click unsubscribe button in the email (email scanners will GET every URL you link to check for malware and you end up auto-unsubbing your recipients) but emails already inherently contain personal information: the email address they're directed to.