hi all, There are several internet forum posts about this problem but have not come to a solution. Maybe you can help me. Setting: Exchange 2013 CU 1 in a DAG configuration when i send a mail to my domain the sender receiving the following message: # <# 5.4.4 smtp; 554 5.4.4 SMTPSEND.DNS.NonExistentDomain; nonexistent domain> # SMTP # When i do an incoming SMTP test form the site https://www.testexchangeconnectivity.com to my domain i receive the error: additional details The server presented a status code 451 - Error in processing. The server response was: 4.7.0 Temporary server error. Please try again later. PRX2 Details exception: Message: Error in processing. The server response was: 4.7.0 Temporary server error. Please try again later. PRX2 Type: System.Net.Mail.SmtpException Stack Trace: at System.Net.Mail.DataStopCommand.CheckResponse (SMTP Status Code Status Code, String server response) at System.Net.Mail.DataStopCommand.Send (SMTP Connection conn) at System.Net.Mail.SmtpClient.Send (MailMessage message) at Microsoft.Exchange.Tools.ExRca.Tests.SmtpMessageTest.PerformTestReally () Last night I got from the website: https://www.testexchangeconnectivity.com an incoming SMTP test and it gave no error messages. Who sees the connection in these error messages? Sincerely, Martien van Dijk -------------------------------------------------------------------------------- Please remember to mark the replies as answers if they help and unmark them if they provide no help. Check out My Blog!

anyone?Sincerely, Martien van Dijk -------------------------------------------------------------------------------- Please remember to mark the replies as answers if they help and unmark them if they provide no help. Check out My Blog!

Hello Martien Please go to below location --Right click network icon in notification area (right low corner) of your server and click Open Network And Sharing Center --Click on Change Adapter Settings --Press ALT key and select Advanced -> Advanced Settings --Check the priority of network cards and see the DNS server communication one should be above replication one also check if you have disabled IPv6, it should be enabled in case you are installing exchange 2013. Thanks Prem P Rana MCSA Messaging 2003 MCSE 2003 Server MCTS MCITP Exchange 2007, 2010 Gurgaon, India http://blogs.msexchange-experts.com

What I forgot to mention, I'm using Address Book Policies. @ Prem Rana, thanks for your comment. I already checked and that your advice is not the solution.Sincerely, Martien van Dijk -------------------------------------------------------------------------------- Please remember to mark the replies as answers if they help and unmark them if they provide no help. Check out My Blog!