The HTML5 Viewer's reportSource does not contain a report instance. The reportSource is a description of the report and the parameters the client wants to use for that report. This information is sent to the Reporting REST service to be handled on the server, where the service creates an instance of the report.
For more details check How to: Set ReportSource for Report Viewers
In your case you can post the information from the viewer's reportSource.report (string) to your own controller's action. In code you can determine which report to instantiate and export programmatically
. Once you have the document's bytes, you can add them as an attachment to an e-mail.
I hope this information is helpful.
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