To configure Exchange to send all outbound mail through the DNS2Go mailserver you will need to configure the following:
1) Open Exchange
2) Create a new SMTP Connector
3) Under the General Tab Specify Forward all mail through this connector to the following smart hosts
4) Enter in mail.dns2go.com
5) Specify the local bridgehead (usually only one entry is listed)
6) Click on the Advanced Tab
7) Click on Outbound Security
8) Select Basic Authentication and click Modify
9) Enter in your domain name for the username and then your password
Now all mail that is sent through Exchange will go through this SMTP Connector and be sent through the DNS2Go mailservers.