On Mon, Oct 06, 2008 at 04:09:38PM +0100,
John L <johnl(_at_)iecc(_dot_)com> wrote
a message of 22 lines which said:
I'd suggest doing a lookup for A for _domainkey.$DOMAIN, and if you
get NOERROR (that is, 0 records but no error code), then check
*.$DOMAIN.
I've finally used such an algorithm, but more detailed (you can find a
lot of strange things in the DNS). I attach the Python module which
tests if a domain has a wildcard.
But it does not solve completely my "find DKIM records" problem since,
now, I find the records only in non-wildcarded domains. The wildcarded
domains may be have DKIM and may be not, there is no way of finding it
in the DNS. So, it seems you cannot really survey the deployment of
DKIM by just asking the DNS (unlike what happens with SPF).
Thanks for all those who helped.
DNSwildcards.py
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