QNAP Security VioStor NVR (Version: 3.3.2) - Manual (Page 174)

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(4) Email
To allow the system administrator to receive an instant email alert when an event is
triggered, enter the SMTP settings. Multiple email addresses can be entered as the
recipients. You may also select to attach the snapshots of the multiple channels (IP
cameras/video servers) available on the NVR.
Click ‘Select from the list’ to select an action setting which has been configured
before.