Possible causes include 1)an authoritative host was not found in DNS, 2)the smart host entry is incorrect, 3)the fully-qualified ...

{4}: Possible causes include 1)an authoritative host was not found in DNS, 2)the smart host entry is incorrect, 3)the fully-qualified domain name (FQDN) in the HOSTS file (this issue was fixed in Windows 2000 SP3), 4)There was a DNS failure or you constructed an invalid IP address for your smart host, 5)SMTP VS does not have a valid fully-qualified domain name (FQDN), or your SMTP VS FQDN lookup failed and 6)a contact's SMTP domain does not resolve to any SMTP address spaces. Troubleshooting: Use Nslookup to check the DNS. Verify that the IP address is in IPv4 literal format. Verify that there is a valid DNS entry for the server or computer name in question.
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