Exchange 2013 - Unable to relay messages to external addresses through exchange from database server through receive connector
We have just migrated to exchange 2013 from exchange 2010 and incoming and outgoing email works fine from clients to the exchange server.
We have a database server which needs to send emails through our exchange server to an external email address. I have created a receive connector for the frontend transport role (as we have both roles installed on the same server and I have read that it is recommended to use the frontend role rather than the hub transport) and used the custom type. I have left the network adapter bindings as it and set the ip address of the database server in the remote network settings. Finally I have edited the security to allow anonymous users and through the exchange management shell run:
where exchange 2013 is our server and isamsemails the connector. This processes correctly.
I am still unable to send messages from the database server to external addresses though. I get error 550 5.7.1 unable to relay in the logs. I can send emails internally but not externally. I have tried rebooting the server but still no joy.