Here are the steps I continue to use over and over to build utilities/project servers in OpenVZ. Utilities servers host web apps, mailing applications, etc for my company. We usually build them as self-contained little appliance-like servers. My vision and goal is simple == better every day!
First, we create the virtual machine:
Now that we are in the virtual machine and away from the HN we add the REMI repo and apply the updates directly on the box.
Add Postfix and switch it on via system-switch-mail