Is this the case if the MX entry is a 'real' entry, but doesn't resolve to an IP address?
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If you are saying that the MX record has a domain name that has no valid A record associated then it is not a legitimate entry - it violates the RFC.
If you are saying that the MX record has a domain name with an associated A record, but that system is unreachable then the host is ureachable, next MX????
Too bad he doesnt post on the MERIT NANOG list Perry Metzger, or Paul Vixie will certainly set him straight, ofcourse he might have no idea who they are.
Gerardo A. Gregory Manager Network Administration and Security ------------------------------------------------- Affinitas - Latin for "Relationship" Helping Businesses Acquire, Retain, and Cultivate Customers Visit us at http://www.affinitas.net
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