We just solved the problem at hand (route mail to different servers based on source rather than destination in Exchange 2007). We were able to create a 2. recieve connector and use the LinkedReceiveConnector property of the set-sendconnector cmdlet. This was only possible because the sending system is not clients, but an application on a specific server.
The questions still stands:
Is it in any way possible to route mails from a specific sender (or sender domain) to a specific send connector, so that you get (almost) the same functionality as when using connector restrictions in an exchange 2003 environment?
Microsoft
