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Apparently, List-Unsubscribe and friends are not something that just mailman and few other geeks use :) :
http://www.ietf.org/rfc/rfc2369.txt
http://www.list-unsubscribe.com/
https://support.google.com/mail/answer/81126

It can't surely be expected to magically fix bug 52915, but it can't harm.
Actually, this would be nice to have also in core enotifs.

In a sea of confusion about email relay, this seems the lowest hanging fruit (see dependencies of bug 52915); raising priority.

The WMF core features team tracks this bug on Mingle card https://mingle.corp.wikimedia.org/projects/flow/cards/390, but people from the community are welcome to contribute here and in Gerrit.