An actually *useful* mail-list message footer

I present for your consideration an example of what Apple is appending to
lists.apple.com traffic these days:

_______________________________________________
Do not post admin requests to the list. They will be ignored.
X11-users mailing list (X11-users(at)lists(dot)apple(dot)com)
Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/x11-users/tgl%40sss.pgh.pa.us

This email sent to tgl(at)sss(dot)pgh(dot)pa(dot)us

(This is in addition to List-Unsubscribe and the other standard headers.)

I don't know whether the mail software we use can cope with customizing
trailers per-user like this. But if it can, I submit that an
unmistakable how-to-unsubscribe link would be lots more useful than the
TIPS are.

regards, tom lane