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Every month or so we get bug reports / request for clarifications from people unable to validate their web site due to DNS problems. Most often these are mis- configuration problems rather than DNS problems from validator.w3.org, there should be a note explaining how people should resolve the issue without contacting us.
Didn't know it was such a frequent problem. Added a message pointing to some DNS record checker. http://dev.w3.org/cvsweb/validator/httpd/cgi-bin/check.diff?r1=1.351&r2=1.353&f=h