Was curious how one would pull a report to see what display our emails are most commonly viewed on. I've played around with smart list, but can't really find any filters that talk about web vs mobile views. Any help would be great appreciated.
You should post this in products for more visibility!
The new email insights reporting is great for this if you are looking for high level metrics.
Click My Marketo, Email Insights.
On the right there is an option to see by device the engagement level.