The IMAPISupport::CompleteMsg method performs postprocessing on a message.
HRESULT CompleteMsg(
ULONG ulFlags,
ULONG cbEntryID,
LPENTRYID lpEntryID
);
The IMAPISupport::CompleteMsg method is implemented for message store provider support objects and is called only by message store providers that are tightly coupled with transport providers. Tightly coupled store providers call IMAPISupport::CompleteMsg to instruct the MAPI spooler to postprocess a message.
Call CompleteMsg only when you are tightly coupled with a transport provider, you can handle all of the message's recipients, and one of the following conditions exists: