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- the ID of the sending
- -1 in case the operation is not completed successfully (e.g. due to incorrect parameters or system failure).
- -3 in case the request command to start import to MailUp of the recipients included in the file fail. (e.g. due to an import operation already running that the system doesn't recognize).
Since SendMessageNL starts an asynchronous task, in some cases a failure may occur after the method call is completed. In this case the failure is notified by means of an alert
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