I setup a new receive connector in Exchange 2007 following...... "Option 2: Grant the relay permission to Anonymous on your new scoped connector" from this link.....
After setting this up and restarting the Exchange Transport Service I tried sending an external email through Exchange from the Application server but I still get the relay bounce back message "#< #5.7.1 smtp;550 5.7.1 Unable to relay> #SMTP#"
When I send an email from the Application Server to an Internal email account the email is processed correctly and when I look in the Exchange message tracking, the Connector ID is the Default Receive connector and not the new Relay Receive connector that I created for this Application Server thus it seems that the Default connector is receiving this mail instead of the New Connector I created.
I really didn't want to mess with the Default Connector and cause a larger issue. What are my options?