Nenu can be run with a window scheduler and normally run during off hour to clean up the db. Not sure why you would want to batch it. It would require the setting file to execute. The nenu log will tell you if it found batch in pending state and for execution.
Normally it looks for batch status pending or done and process. The only return code would be shown in the log. Maybe you can call the logsent mail and use smtp for notification.
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