Split Domain Routing issues

Hi All,
We are currently running Split Domain Routing between Ms Exchange 2010 and Zimbra, with exchange box set as primary MX, sharing a single domain (domain.com)
Emails for [email protected] will be received by Ms Exchange, emails for existing user in exchange is delivered directly to mailbox and all other non-existance [email protected] is routed via smart-host to zimbra.
Is it possible to configure exchange "only" to route emails to users we know exists in zimbra to zimbra, rather than to route all emails for non-existance [email protected] to zimbra ?
Thanks.
George

The most effective way I have found for configuring split-domain routing is to set it up so it's not really routing for a single domain.  In your example, I would do the following:
Configure the Exchange side to receive all inbound messages and be authoritative for domain.com
Create two additional accepted domains:  Exchange.domain.com and Zimbra.domain.com
Import all addressees in the Zimbra system and give them the external email address of
[email protected]
Give all of your Exchange mailboxes the secondary proxy address of
[email protected]
In Exchange, create a send connector for the address space zimbra.domain.com that uses smart host routing and sends directly to the Zimbra servers
In the Zimbra system, tell it that all email bound for exchange.domain.com needs to be delivered to the Exchange hub servers directly
If users get added to Zimbra, you add associated contacts in Exchange.  You can have your Exchange users as contacts in the Zimbra system, but if you do, you will need to make sure they have the
[email protected] address, so their mail gets routed accordingly.  You can also create a receive connector that accepts mail from Zimbra so that it needn't go through the same hygiene products if
you wish, but this isn't necessary.
Oh, and this will give you the solution you asked for in your final question - you will only route mail to Zimbra for mailboxes that actually exist in Zimbra.
Sounds like a good idea. I'll try it first and let you know if it works.
Thanks.
George

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