There are two kinds of "not found" responses in the DNS: NXDOMAIN and
NODATA.
NXDOMAIN (RCODE=3) means the name does not exist in DNS. NODATA
(RCODE=0 + ANCOUNT=0) means the name is valid but no records of the
requested type were found. We're only interested in the first one.
So, our side in the debate is not operating from a misunderstanding of
DNS as far as I can tell.
--
Arvel
_______________________________________________
NOTE WELL: This list operates according to
http://mipassoc.org/dkim/ietf-list-rules.html