Log into SmarterMail as admin.
Click on the “Settings” icon at the top.
Click on “General Settings” in the left window pane.
Click on the “Server Info” tab.
Modify the values for IP of Primary DNS and IP of Secondary DNS to point to your desired DNS servers.
SmarterMail will now use the custom DNS servers to perform lookups when sending mail.
If you need any assistance with this process, or encounter any issues, please don’t hesitate to contact our Technical Support Department.