Split Domain with OS X Postfix

[wickhamandrew]

Does anyone know how to configure OS X Postfix to allow split domain with Zimbra? I have looked over the guide and I believe I have everything working on the Zimbra side of things but I can't figure out how to do the configuration to set up OS X Postfix as our primary mail server.

Here's what we want our setup to be:

Primary Mail Server:
Mail Domain: lake.stark.k12.oh.us
DNS: x3.lake.stark.k12.oh.us
IP: 10.24.45.2

Secondary Mail Server:
Mail Domain: lake.stark.k12.oh.us
DNS: zimbra.lake.stark.k12.oh.us
IP: 10.24.40.97

Any help is greatly appreciated. Thanks a ton.

[wickhamandrew]

After piddling around with this for a complete day I have finally figured out what steps need to take place in order to do this correctly.

The first step is to do the Split Domain instructions for Zimbra as a secondary server. Then on your primary server, the OS X server, do the following.

In /etc/postfix/main.cs add this line if it doesn't already exist

transport_maps = hash:/etc/postfix/transport

Then in the transport file (/etc/postfix/transport) add the following lines for each user you want to have on the Zimbra server:

user@example.com    smtp: zimbra.example.com

Now execute the following command:

postmap /etc/postfix/transport

And finally, restart postfix:

postfix reload