I have just finished installing Zimbra on my server. But I'm having some problems configuring it to my needs.
Before installing it I had all my mailboxes hosted by my ISP and the mailboxes domain is let's say myisp.com
I want to keep the names of my mailboxes exactly the same and have them hosted on my zimbra box.
So I have created a domain with the same name as my ISP (myisp.com) and created these mailboxes email@example.com, firstname.lastname@example.org
For the incoming mail I will use fetchmail to retrieve it from my remote boxes. But for outgoing mail I can send locally to other mailboxes on my new local domain. But when I send to remote boxes on this domain (myisp.com) they can go out of my box since they consider it as a local mail.
So what I am asking is there is a way to tell zimbra (postfix) to serve locally only this boxes of this domain and for all the rest it will have to relay them to my ISP's SMTP server.
It's really urgent for me to get this working. Thanks in advance to all.