On Wed, 30 Apr 2008, Arvel Hathcock wrote: > > Enter the NXDOMAIN check. If, as part of the ADSP algorithm, an > NXDOMAIN check is performed, the algorithm can quickly detect that the > domain doesn't exist and that _this_ might be the reason there is no > ADSP record. This added insight closes the hole and can be used by > filtering agents.
NXDOMAIN is the wrong check. A domain is not a valid mail domain if it has neither MX nor A nor AAAA records. If it has a TXT record then a lookup will not return NXDOMAIN even though it is not a valid mail domain. Tony. -- f.anthony.n.finch <[EMAIL PROTECTED]> http://dotat.at/ BISCAY: SOUTHWEST 5 BACKING SOUTH 4. ROUGH BECOMING MODERATE. SHOWERS. GOOD. _______________________________________________ NOTE WELL: This list operates according to http://mipassoc.org/dkim/ietf-list-rules.html
