[eli]

Yes, that's the List-Unsubscribe header and it doesn't require a POST request.

Email deliverability has always meant staying on top of changing requirements.

[boplicity]

No -- this actually expands on the List-Unsubscribe header, and adds a POST request header for one-click unsubscribe.

From the RFC:

> This document addresses this part of the problem, with an HTTPS POST action

Look at the examples in the RFC for a clear description.

[eli]

Ah, my mistake. The MAILTO: style unsubscribes were a bit of a pain to deal with anyway.