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Your message did not reach some or all of the intended recipients because Host Unknown

The following recipient(s) could not be reached because Host Unknown

Directory server was not found in DNS

Symptoms: 1. When attempting to send Internet mail, you may receive the following: Your message did not reach some or all of the intended recipients. The following recipient(s) could not be reached:
c=US;a= ;p=org;o=site;dda:SMTP=blin@chicagotech.net; on 4/1/2005 10:334 AM The e-mail system was unable to deliver the message, but did not report a specific reason. Check the address and try again. If it still fails, contact your system administrator.The MTS-ID of the original message is:c=US;a= ;p=org;l=mvpmail-010213172832Z-2385 MSEXCH:IMS:org:site:mvpmail 3902 (000B099C) Host Unknown.

2. When attempting to use Exchange Server Best Practices Analyzer Tool, you may receive error indicating that a directory server was not found in DNS.

Analysis: When you install DNS on a Windows 2000 server that does not have a connection to the Internet, the zone for the domain is created and a root zone (dot zone) is also created. This root zone may prevent access to the Internet for DNS. When Exchange 2000/2003 searches for an MX record to deliver mail, Exchange 2000/2003 queries the DNS server. The DNS server has no knowledge of MX records on the Internet or other DNS servers that might have those records, so Exchange 2000/2003 is unable to route any outbound messages.

Resolution: Remove the Root Zone (Dot Zone)

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