I have a Windows Server 2012 with Exchange 2013 on it. The server is also domain controller and DNS server and functions as DHCP server for the clients. The client workstations vary from some Windows XP, Windows Vista, Windows 7 and mainly Windows 8 PRO.
The IP settings on the server are as follows:
Subnet mask: 255.255.255.0
Mail is working fine internally, however if I want to send any mail out externally, it gets stuck in the queue. In order to release the queue I have to flush the DNS. Mail is released, but the same issue appears after some minutes. The strange thing is that I cant find any DNS related events, beside that DNS server is started.
Is there anyone who recognizes this issue? any help is greatly appreciated.