Exchange 2013 and Internal DNS Sending Mail Issue
Posted on 2014-01-27
Here is my scenario.
Exchange 2013 sitting on a 2012 Server in a domain.
Has regular LAN IP address, and is single email server for a company.
Uses Internal DNS of PDC in domain.
Having an issue with only 1 client when sending email.
So on the exchange box, i did an nslookup and got their email server name, which from the same exchange box, i can ping. so I also did a tracert and a telnet to that email server on port 25 and it all works.
But when I check the queue viewer app, it tells me unable to connect, unable to resolve DNS name. So i scratched my head, and changed the DNS IP to the ISP dns rather than internal and it works. Only problem is all internal clients on outlook stop working, so i changed it back.
So i try another internal DNS server and no luck either. I dont understand how this is possible. If i can resolve in a command prompt and via telnet, why doesnt the exchange send connector resolve it?
Ill take any suggestion...