Intersight receives all the faults detected on the target and shows it under the GUI.
Under System > Settings > Notifications > Add Rule, we have an option to choose the Severity level(Critical, Warning, Info) of the Alarms for which we want the notifications.
If the faults/events triggered by NetApp fall under one of these categories, you can uncheck that option to not receive those over email. But this would also stop alarms for other devices claimed in Intersight not just NetApp.
At present, we don't have an option to choose individual faults/devices for which we want to receive email notifications.
Kindly submit a feature request for this in Intersight.
Intersight Webhooks could be an alternative where you can do filtering but that would require a Webhook receiver on your end.