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Include List-Unsubscribe-Post header to indicate one-click functionality #617
Looking at an email that was sent from Mailchimp there was a List-Unsubscribe-Post header that I had not noticed previously.
The purpose of that header, explained in https://tools.ietf.org/html/rfc8058, is to provide a signal that the List-Unsubscribe header field has one-click functionality, which phplist does have because of the
Adding this header can have a positive effect in making mail systems display an Unsubscribe button or link. Testing this with my Yahoo account using the Android Yahoo app, without the header Yahoo did not offer an unsubscribe option, but with the header it did.
Screenshots (if appropriate):