Sharing a domain between Exchange 2003 and postfix

Hi

We have installed a Postfix server (latest versions & updates) on site that has an Exchange 2003 server

We have managed to configure forwarding of mail from Postfix to Exchange, but not the other way around.

I thought that the 'forward all mail with unresolved recipients to host' option would suffice, but apparently this probably refers to emails belonging to different domains.

So we followed the detailed and well laid out directions in the
following article.

We created an additional address space @localhost in the default recipient policy which we defined as the primary address space, and ticked the option "This Exchange Organization is responsible for all mail delivery to this address" and deleted the current address space (our original domain).

We then created a second recipient policy in which defined an address space corresponding to our original domain, declared it as primary, ensured that the option "This Exchange Organization is responsible for all mail delivery to this address" remained unticked, and left the second address space in the list (@localhost) alone.

We created an smtp connector, named it, indicated within square brackets our Postfix IP internal address in the 'Forward all mail through this connector to the following smart hosts' field and selected our Exchange server as bridgehead server.
We then added our domain (address space) omitting the @, and ticked the 'Allow messages to be relayed to these domains' option.

We then restarted the routing engine and the SMTP service
 
But forwarding isn't happening.

any ideas ?

thanks

yann