How to configure Zibra As Internal relay server

We have a mail server that hosted in  isp side and we are installed a zimbra opensource mail server .our requirment is zimbra as a internal relay server . that is all internal user mail routing  through the  same server and send external mail to my isp mail server(smart host) also download email from external mail server map to internal email id .
 how to configure this type setup in vmware zimbra 8.x.x

we are alredy test this type senario in exchange server 2010 with pop3 connector our mail server diagram
[SouthMod: closed on 10/13/2013 03:36 AM]
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You can use the zmprov command to setup Zimba as relay -

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