I'm trying to relay emails from an on-prem Sharepoint server through Exchange online.
I've followed this article: http://support.microsoft.com/kb/2600912
but am getting an error:
Message delivery to the remote domain 'cloud2020.co.uk' failed for the following reason: Unable to bind to the destination server in DNS.
I don't believe the error is with the SharePoint outbound settings, and I have checked the 'SendAs' for the distribution group and that is fine.
I have checked all ports, authentication, and server settings in the SMTP Virtual Server properties but cannot find any error. Can someone point me in the right direction or where to look to track down the error?