I am running Exchange Server 2003 on a MS 2003 Server SP1. Today all of a sudden we stop receiving inbound mail it just stop. I have checked everything no error messages. I can ping via the IP address of the mail server but not via domain name this is true also with our website. When trying to access OWA I can only gain access if I place the external IP of the server but not the domain name.
I tried sending an email from the outside, after a few hours I received a 451 error indicating "Name Server Timeout"
Please help...mail has been down since this morning and I cannot figure out why...
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