MSMQ mail messages sent to Exchange users are sent to the server input queue of the Exchange Connector. MSMQ mail messages are then routed through the Exchange Connector where they are translated and sent on to the Exchange Server where they are distributed to the appropriate Exchange user (see illustration below).
When an MSMQ message is sent to an Exchange user, the Exchange Connector performs the following functions:
The MSMQ application must know the address of the Exchange user it is sending messages to.
Additional information can be found in the following: