The server response was: 4.7.0 Temporary server error. Please try again later. PRX3

Hello, 

I just setup an exchange 2013 server  with hosted with the same machine of Active Domain Controller.

I tested the connectivity of the server , i found that the mailbox can only send email to external mailbox however it cant receive any mail neither  from external mail nor internal mail.

I ran a test from exchange connectivity analyzer for inbound mail and it failed with the following message. 

The server returned status code 451 - Error in processing. The server response was: 4.7.0 Temporary server error. Please try again later. PRX3

I did a search on this forum and found the following thread

social.technet.microsoft.com/Forums/exchange/en-US/288e1619-ce56-4c3a-8bb1-4886835520fe/delivery-fails-the-server-response-was-470-temporary-server-error-please-try-again-later?forum=exchangesvrdeploy

but no luck , i dont know how to set an alternative host, would somebody please help.

error details:

Message: Error in processing. The server response was: 4.7.0 Temporary server error. Please try again later. PRX3 
Type: System.Net.Mail.SmtpException
Stack trace:
at System.Net.Mail.DataStopCommand.CheckResponse(SmtpStatusCode statusCode, String serverResponse)
at System.Net.Mail.DataStopCommand.Send(SmtpConnection conn)
at System.Net.Mail.SmtpClient.Send(MailMessage message)
at Microsoft.Exchange.Tools.ExRca.Tests.SmtpMessageTest.PerformTestReally()