Sorry, I don't remember, I did it trial and error, finally got it working, but It was not stable, would stop accepting connections, and constantly required rebooting. So I changed platforms to ClearOS. Checkout ClearOS instead. It's free, has alot of other modules available, is easy to setup and configure. Also I have a step by step walk through on my website in the Technical Articles Section to customize it so you don't have to have an alias created on the ClearOS box for every internal email recipient including Email Enabled Distribution Groups.