I need email that I can send and receive CUI over. When talking to resellers, they talk like we need to implement a ton of things...to the tune of $3k setup fees. We are a small manufacturer, our IT infrastructure is solid and compliant... just needing to have a 800-171/DFARS/CIS compliant way to get the CUI on the network. Can anyone who has implemented GCC High or another platform tell me if any of that is necessary? If we were to get GCC high and only use email, is there additional infrastructure that needs set up with it?