I currently look after an SharePoint 2013 Server running in an SBS 2011 network with local Exchange. We had the internet service changed over from ADSL to NBN (fibre) link.
I have issue sending emails out of SharePoint. I created a virtual SMTP service which worked in the past with no issues.
Since the change over I can no longer send emails to any sender of my domain but seem to have no issues sending emails to outside recipients. Looking at the event log I get a warning smtpsvc event id 4000 "Message delivery to the remote domain 'mydomain.com.au' failed for the following reason: Unable to bind to the destination server in DNS. "
I have been using a smarthost to send emails out of the virtual smtp service.
I'm not sure what they are looking for? I would have expected the smarthost to route the email rather than the local DNS server.
I also tried to create an receive connector in exchange for SharePoint. Even if it is set to anonymous is still rejects with authentication error. Any help is very much appreciated