[Mailman-Users] Mailman + Exim + strange headers

[Stephen J. Turnbull]

Natu writes:

 > If there is a dkim signature and it fails google will treat it as
 > spam

Note that, taking your words literally, this is against the DKIM RFCs
-- a failed signature is supposed to be treated the same as a lack of
a signature.

That doesn't mean that Google can't or doesn't use it.  In particular,
if the percentage of spam in the "failed or no signature" class goes
up (which it will if you start signing), your "failed or no signature"
rating will slump.  That effect might be enough to send unsigned mail
from your site to the spambucket.

But you can be sure that a valid DKIM signature will improve your
site's reputation.