Here is my problem : i have set up an exchange 2007 platform. My hub transport server is configured to use DNS to send emails directly through the Internet. For the moment, it works for every domain except one.
When I try to send emails to this exception, in the queue viewer I have an error message returned : "451 4.4.0 DNS Query failed".
But when I open a command prompt on my hub transport server, I type these lines :
set type = MX
The name resolution is done successfully...
Does anyone have an idea that could help me ?
Thanks in advance.