Michael Glaesemann <grzm@seespotcode.net> writes:
> (And are there mail readers out there that can pick those subscribe/
> unsubscribe headers from the list emails? Now *that'd* be sweet.)

Well, in my fairly ancient copy of exmh, any message with such headers
causes an additional menu to appear:

List...
help
unsubscribe
owner
subscribe
archive
id
post

Clicking on any of these takes you to the webpage referenced by the header.
(It looks like it's just generating menu entries for whatever "List-foo"
headers it finds; the behavior isn't real helpful for headers that don't
contain URLs, but most of these do.)

Whether there's anything mass-market that knows about these headers,
I dunno, but it's not like the spec hasn't been out there plenty long
enough:
ftp://ftp.rfc-editor.org/in-notes/rfc2369.txt

regards, tom lane

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