I work for a small educational non profit institute. I have setup zimbra and it is fuctioning ok.
I need a help on a couple of points
1. My institute has a remote hosted email say abc.edu, which we currently use for mailing. I need to setup a system for internal mailing
Can i have a system wherein i use the same abc.edu domain and the server responds in the following way
In case a user does not have a local abc.edu account it is automatically forwaded to our remotely hosted email service, what changes do i need to make
2. What changes do i need to make in the client (most of the users use outlook express) So that the local mail server is used

Pls excuse me if the questions are too trivial I am not too familiar with these systems