I am the systems administrator for a medical company in South Africa.
We are currently using a Exim Set up with 3 boxes, each located in our 3 branches connected via a VPN.
Each server hosts that branches email locally.
I would like to keep the existing infrastructure, however I would like to replace the Exim boxes with Zimbra Open Source.
I have installed a single instance of Zimbra and placed in production.
I would like to know if there are any specific How to Guides or additional steps that I would need to set up.