Hi I'm wondering how I can configure for the following:

Some users on Zimbra server, rest of the users on another non-Zimbra mail server. Both group of users belong to the same mail domain.

How do we configure Zimbra server to route mails that are meant for users hosted on the non-Zimbra server?

On some mails server, they have a simple setting that says forward mails to server xxx if users don't exist. Does Zimbra have similar settings?