Exchange 2003 sending mail to incorrect domain   

Hi,

I'm having a problem sending to one domain.  The domain is emirates.net.ae 
When sending mail to this domain the user gets a NDR the there was a DNS 
error sending to ermirates.net.ae.  Event Viewer on the Exchange 2003 server 
shows an error sending to emirotes.net.ae.  Looking at the mail queue shows 
Exchange sending to emirotes.net.ae.

The Exchange Server machine -(network settings)  is set to use local -(no 
forwarders) DNS.  The Exchange Virtual Server is pointed to the DNS server 
on my ISA server that does use our ISP's DNS servers as forwarders.

Nslookup on the Exchange server fails to resolve external hostnames -(as 
expected) using internal DNS servers.  When switching to the DNS server the 
Exchange Virtual Server is using, it correctly finds A and MX records for 
the domain emirates.net.ae.

This problem is only occurring with this one domain!  I've rebooted the 
server, cleared the cache on all DNS servers, looked at the cache on all DNS 
servers, and done an ipconfig /flushdns  on all the DNS servers and Exchange 
server.  Also checked host files on all machines as well as

I have also set diagnostic logging at max for Exchange Transport, but no 
help there.  Internally it knows emirates.net.ae -(based on the NDR the user 
gets), but when it tries to send it is looking for emirotes.net.ae.

The DNS cache on the DNS server -(the one on ISA that is set in the Exchange 
Virtual Server) does have emirates.net.ae, and nothing in the cache for 
emirotes.net.ae.

Thanks,

Mark

date: Tue, 2 May 2006 00:17:32 -0400   author:   Mark McNally