NDR 5.4.0 - destination server for this recipient could not be found in DNS

Case Study – NDR: #5.4.0 - The destination server for this recipient could not be found in Domain Name Service (DNS)

Situation: The client just installed SBS 2003 and FQDN is server.chicagotech.local. He uses dyndns.org to create MX pointing to mail.chicagotech.net. Since he doesn't have a router, he uses the SBS as RRAS with NAT enabled. He can send email out but not receive from outside. The internal email works. The outside sender may receive this NDR: 5.4.0: The following recipient(s) could not be reached: BobLin@chicagotehc.net on 8/15/2005 7:46 AM
The destination server for this recipient could not be found in Domain Name Service (DNS). Please verify the email address and retry. If that fails, contact your administrator. <mail.ms-mvps.net #5.4.0>.

Troubleshooting:

NAT has opened SMTP port.
Telnet port 25 looks like this: mail.chicagotehc.net claims to be non-existent host chicagotehc.net: 220 chicagotech.net Microsoft ESMTP MAIL Service, Version: 6.0.3790.211 ready at Mon, 15 Aug 2005 11:32:47 -0500

Analysis:

after studying all information carefully, we find the BobLin@chicagoteHC.net doesn’t matches the real domain name BobLin@chicagoteCH.net. To confirm that, we open Exchange System Manager>ChicagoTech>Server>servername>Protocol>HTPP>Exchange Virtual Server. Right-click on Exchange and select Properties. It displays ChicagoTehc.net instead of ChicagoTech.net. (Note: you can’t change the name there and it is grayed out).

Solution: run SBS Connect to the Internet Wizard to change the name.

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