"list-unsubscribe" mail header & no footer

[Ralph Seichter]

* André-John Mas:

> Maybe this is impacting me only?

Looks like that might be the case: https://imgur.com/a/0KtaLZM

The screenshot I took shows that Apple Mail displays an "unsubscribe"
action buttion for me. I am running macOS Monterey (version 12.3.1).

-Ralph