Ok, I've read the Multiserver howto, installed Zimbra but I cannot contact my mail server.
Problem is, we are using Cyrus IMAP, Postfix, and we cannot change this. So, I'd like to install Zimbra as a "frontend" of these services. But I cannot find a way to do this. All I've seen is "Imap Sync", which is not what we want - I want Zimbra to look for e-mails on the Cyrus Imap, not to syncronize.
How can I do this?