* Bill Cole via Postfix-users:

> Some systems are configured to "oversign" headers, essentially signing
> the non-existence.

Shhh! We don't want to advertise that in this scenario, do we? ;-)
Still, you are correct to point out that the DKIM spec allows for these
kinds of shenanigans.

> Any addition of headers that are oversigned will break a DKIM
> signature. Some ill-advised systems oversign List-* headers on every
> message.

Ill-advised is putting it mildly. If one is messing with the headers
which make mailing lists work, but allows their users to subscribe to
mailing lists, one is more than a little cookoo.

-Ralph
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