On Sun, Jul 20, 2025 at 12:04 PM Andy Smith <[email protected]> wrote: > > On Sun, Jul 20, 2025 at 05:48:01PM +0800, Bret Busby wrote: > > Perhaps, the List Administrators could find worthwhile, to add a footer to > > the mailing list messages, something like > > > > "To unsubscribe, change your subscription mode, or view the list archive, > > see https://lists.debian.org/debian-user/ " > > > > Simple, but (should be) effective. > > In the past the Debian list admins have stated they will not do this, > for a couple of reasons. One of the reasons is that altering the content > of the message (which would also include any tags added to the subject > line) would invalidate any DKIM signature present and make it harder for > the message to be delivered. > > Most mailing lists that change the content by adding subject tags and/or > footers also rewrite the From address to be from the list itself, e.g. > in that configuration this list would have: > > From: Bret Busby via Debian User <[email protected]> > > The mail would then be signed on behalf of lists.debian.org and would be > treated as a new email. > > Myself I think this was a sad concession that had to be made in the name > of user experience and I did change most of the lists I operate to work > this way. I don't expect Debian ever would though.
Maybe the List-Unsubscribe header would help, <https://datatracker.ietf.org/doc/html/rfc2369>. The list software can add it without worrying about breaking DKIM signatures. A good user agent would display a UI widget to act on List-Unsubscribe to make it easy to unsubscribe. Jeff
