I am getting a "451 4.4.0 DNS query failed" on one domain.
Things I have tried:
nslookup with type=mx. This returns 4 mx records with values of 0,5,10,20,30
telnet to port 25 for each record succesfully
set internal and external DNS to "all available NICs"
changed forwarding on DNS to public DNS servers as well as the ones listed by my ISP
Turned on protocol logging for send Connector
Exchange 2007 RTM (current Rollups)
Microsoft Windows Server 2003 R2 Standard x64
Thanks in advance.
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