Send notifications on email request ONLY

Send notifications on email request ONLY

We receive most of our requests through email, but a number of them are also received as walk-in tickets or over the phone, and are hand-entered into SD+.  I currently have the notification rules set to send an email whenever a new request is created.  However, this means I get notifications for requests such as when our level I tech enters a ticket for routine maintenance, which I don't need to see.
 
Is there any way to filter the notifications so I'm only notified when a request is created by email, or when an unassigned request is created?
 
Thanks,
 
-Ethan

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