[roastpork]

In the above (marcmac) example, what is zimbra.com? I thought we were dealing with example.com as our domain.

Edit: OK, got it, an alias.

If we are just talking about the example.com domain the only entry we would need to forward accounts not found on zimbra.example.com for example.com to another mail server is the third line:

zmprov md example.com zimbraMailTransport smtp:mail.example.com

And this will first attempt delivery localy.

Thanks.