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Here's what you need to do in order for you to do that.
Select the Notification you would like to have multiple emails set for notifications.
Then, on the Compose Email window, click the "Reply-To and Recipient Settings" button.
The window shown on the image below will show. Edit the Recipient Email field. Put each email addresses that you would like notifications to be sent separated by a comma.
That's it. Click Finish to save the changes and don't forget to save your form.
You may also refer to this document for future references.
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