I assume that you are using the stock email app? If so, note that Exchange is rather limited with notifications (such was my case) and someone suggested CloudMagic-- which is AWESOME--- and I am able to actually view my emails, whereas before, I was only able to see the sender and not much more on the Gear 2.
If you are running stock email and are not interested in CloudMagic, verify that the following is checked...
- Settings> Security> Notification Access> Make sure that "Gear Manager" is checked (which should be if you are getting notifications of any sort on the Gear 2).
- Gear Manager> Notifications> Notifications for Gear> Ensure that "Email" is checked.
I feel like there's one more selection (possibly) within the Email app itself, however I cannot remember straight away.