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Unfortunately we do not have BCc feature in the form's email alert. I am sending a feature request to our backend team and we will get back to you as soon as we have any update from them.
For now, If you just need the emails to be discrete so that users are not able to see to who all the emails were sent, you can just add a new email alert and send submission emails to just one email address. The following guide should help you how to add a new email alert: http://www.jotform.com/help/25-Setting-Up-Email-Notifications
Alternatively, you can only have one email alert but add conditions to send submission emails to different email addresses. The following guide should help you how to send conditional emails: http://www.jotform.com/help/167-How-to-send-to-a-specific-email-address-based-on-a-selection