I was reading a mail from this list where I saw this footer:
Wikimedia-l mailing list, guidelines at:
https://meta.wikimedia.org/wiki/Mailing_lists/Guidelines
Wikimedia-l(a)lists.wikimedia.org
<https://meta.wikimedia.org/wiki/Mailing_lists/GuidelinesWikimedia-l@lists.wikimedia.org>
The mailing list guidelines link redirect to a non-existing page link
Perhaps, this link may be used:
https://meta.wikimedia.org/wiki/Mailing_lists/Guidelines ?