MAPI Spooler Incoming message

Question

Hi all,

When there is a new incoming message , tranport provider will notify spooler. Then spooler will can transport logon::StartMessage with iMessage from default message store.

My question is how can i force MAPI Spooler pass iMessage from my message store which is not default one. Or Am i able to achieve this only if i'm creating a tightly coupling providers(message store and transport provider).

Thanks..