slevy@POINCARE.GEOM.UMN.EDU (08/20/90)
Do you-all have much trouble with host/domain names being sometimes resolved, other times not? We sometimes find mail which bounces with "Unknown host" will other times get through. The current case is with applelink.apple.com. Poking around showed that apple.com has four secondary name servers, some of which gave a correct MX response, while others return an empty answer: nslookup reports "no information" as opposed to "Non-existent domain". One possibility: apple.com seems to contain no explicit applelink.apple.com IN MX ... record, just an MX for *.apple.com. Could some servers be willing to match on wildcards while others aren't? Is this behavior good grounds for complaining to the administrator of a server which doesn't? Stuart Levy, Geometry Group, University of Minnesota slevy@geom.umn.edu