In the configuration tree on the left-hand side open the 'Organisation Configuration' section
Click on 'Hub Transport'
In the central window click on the 'Send Connectors' tab
Right-click in the 'Send Connectors' window and select 'New Send Connector'
We recommend that you name the connector 'AuthSMTP Connector'
For the type of connector, you will need to select 'Custom' in the drop-down menu
Click on the 'Add' button with the green cross
Enter '*' in the 'Address:' field
Click 'Ok' and then click 'Next'
In order to get mail to relay through our servers you will need to setup the 'Smart Host' setting on this screen
This is what tells Exchange 2010 to deliver all mail destined for the internet though our servers
Click on 'Route mail through the following smart hosts:'
Click on the 'Add...' button
In the 'Add smart host' window click on 'Fully qualified domain name(FQDN):' and enter the SMTP server you have been assigned by AuthSMTP and then click 'OK' and click 'Next'
In this window you will need to configure the username and password assigned to you by AuthSMTP
Click on the 'Basic Authentication' radio button and enter your AuthSMTP username and password
Do not enable 'Basic Authentication over TLS'
In the next window 'Source Server' you will need to configure which Hub Transport servers and Edge Subscriptions that will use this connector, for the purposes of this tutorial we have just left it with the default single server.
In the next window it will summarize the details you have entered, please double check that you have entered everything correctly, if you have made a mistake click back and correct it.
Once you are certain everything is correct click 'New'