I am running 8.0.6.GA.5922.UBUNTU12.64 (FOSS).

I have split Domain working perfectly. Mail comes into Zimbra then forwards via the 'zimbraMailTransport' modification on a per-user basis.

How do I get it to stay on the Zimbra server instead of removing? (i.e. dual delivery).

I am trying to smoothly transition some users away from their old server (GoDaddy). Alternatively, if anyone has a better recommended course of action, I am all ears.