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Exchange 2013 can't receive mail - 451 4.7.0 Temporary server error

    Question

  • Hello all,

    It seems like a common problem, but I still have not found my solution. So this is a fresh Exchange 2013 installation on top of a Windows 2012 box (also fresh install) and in a brand new domain (only one other machine running the DC/DNS role). The DC is configured with a forwarder to the Google's DNS and it is able to resolve. The EX is set to use the DC as a DNS server and it is able to resolve. Obviously there is something wrong with the DNS. 

    I've tried:

    - disabling/enabling IPv6 on the EX

    - setting the DNS server setting in Network properties on the DC with an internal address 192.168.xx.xx instead of 127.0.0.1

    - setting only one DNS server on the EX (the DC), no secondary DNS

    - disabling every other NIC. They have only one now.

    - adding the 192.168.xx.xx address in the hosts file of the EX for the name ex1 and ex1.mydomain.com

    Still I experience the same problem.

    Any more ideas that could possible help me?

    Thank you in advance!

    Wednesday, July 24, 2013 7:06 AM

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