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When I test my mail server on https://www.testexchangeconnectivity.com/, it is able to retrieve the MX record, but then fails with this:
Attempting to resolve the host name mail.mysite.org in DNS. The host name couldn't be resolved.
Do I need to setup another record besides MX for a mail server?
1If you provide the actual domain name, it will be more useful in trying to troubleshoot the problem. – None – 2011-01-28T21:55:52.483