dnsdiag
The dnsdiag utility can be used to troubleshoot email delivery problems that stem from DNS misconfigurations. It works by simulating the DNS activity performed by an SMTP agent that is attempting to deliver email. In order for dnsdiag to work, either Exchange or SMTP service needs to be installed on the computer that dnsdiag is run from. If neither is installed, you will see a cryptic error stating that ISATQ.dll was not found.
dnsdiag can be found in the Windows Server 2003 Resource Kit.
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