For more information on the class, see the header file: FeiMailReport.h
If there's nothing in the list, then no report is made. Add items to the report using addToReport.
This method manipulates used by the scheduler, so it contains a critical section protected by a mutex. This insures that the scheduler does not access data at the same time it's being entered.
The function returns FEI_OK on success, some other status value on error.