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Re:How does the Gmail unsubscribe button work? by zbentley on Saturday May 30, 2020 @08:22AM (#23360654)
> I don't see why you have to involve the web at all

Because List-Unsubscribe is very new and not supported by all email clients or ISPs (inbox service providers). Since adoption is so spotty, most ESPs (email service providers) start from a baseline of a web unsubscribe system and (maybe) supplement that with List-Unsubscribe as well.

This situation will likely improve over time.

Re:How does the Gmail unsubscribe button work? by boomlinde on Saturday May 30, 2020 @12:07PM (#23362079)
RFC2369 from 1998 is "very new"? Funny. I guess it's either a matter of perspective.

Adoption of it doesn't matter insofar that you can use the same link in the body as a fallback, which was part of my suggestion.

"ESPs" don't care because cumbersome and convoluted multi-step unsubscribe is a selling point for the majority of people who use such systems. They have moved from simple mail based unsubscribe which was the norm for years.