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Contains a bitmask of flags indicating details about a message submission.
One or more of the following flags can be set for the PR_SUBMIT_FLAGS bitmask:
The MAPI spooler currently has the message locked.
The message needs preprocessing. When the MAPI spooler is done preprocessing this message, it should call the IMessage::SubmitMessage method. The message store provider recognizes that the spooler, rather than the client application, has called SubmitMessage, clears the flag, and continues message submission.