Once 
When you have created one or several notification groups are created, you can enable stream notifications to stream notification in a stream and configure for which events an email should be sent to the notification groups when there is a stream event.
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| name | Stream Event Type |
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which notification group.
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There are several stream event types to send the notifications for.
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To avoid large amounts of emails being sent for the same event, there is a cool-down period of 30 minutes during which email sending is suspended for the same event. During this time, you will only receive one email for a specific event in a stream, even if the event occurs multiple times in the same stream. |
See Set Stream Notification for more information.