First I'm really excited to get to learn and setup a Zimbra server. Here is what I have set for redirects and preauth.
I have set http to redirect to https always. We have successfully setup preauth.jsp to authenticate with our CAS server. However it only works when the link is zimbra.server.com/preauth.jsp. When I use zimbra.server.com it allows me to authenticate with CAS but then redirects me to the Zimbra login which shouldn't happen. The /preauth.jsp link automatically signs me into Zimbra.
I feel like this is such as easy fix that I'm not thinking of right now. Any ideas would be greatly appreciated. We will soon be making a push to get Zimbra implemented at my school and like I said, I'm really excited for it.