Hi,
I don't know how to configure relay from local zimbra server to external zimbra server. I got a GUI from web interface. Under Global settings. But its doesn't work for me.

Local server : test1.example.com (10.0.0.1)
External server : test2.example.com (172.12.12.1)

I want to send mail from local but it want to relay through external server. Please help