title: The server response was: 4.7.0 Temporary server error. Please try again later. PRX3
body: <p>I just setup an Exchange 2013 server hosted on the same machine as the Active Domain Controller.</p>
  
  <p>I tested the connectivity of the server , I found that the mailbox can only send email to external mailbox however it can't receive any mail either from external mail or internal mail.</p>
  
  <p>I ran the Exchange connectivity analyzer for inbound mail and it failed with the following message. </p>
  
  <blockquote>
    <p>The server returned status code 451 - Error in processing. The server response was: 4.7.0 Temporary server error. Please try again later. PRX3</p>
  </blockquote>
  
  <p>I did a search on technet forum and found the following thread</p>
  
  <p><a href="http://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" rel="nofollow">http://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</a></p>
  
  <p>but no luck , i dont know how to set an alternative host, would somebody please help.</p>
  
  <p>error details:</p>
  
  <pre><code>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() 
  
  The server returned status code 451 - Error in processing. The server response was: 4.7.0 Temporary server error. Please try again later. PRX3 
  Exception 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()
  Elapsed Time: 3107 ms.
  The server returned status code 451 - Error in processing. The server response was: 4.7.0 Temporary server error. Please try again later. PRX3 
  Exception 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()
  Elapsed Time: 3107 ms.
  </code></pre>