Enabling Notification Actions allows you to delete, mark as read, or reply to an email directly from your device's notification window, so you don't have to open the app. You can even customize the actions you want to be able to take. Here's how:
1. Tap the Nav icon at the top left of your navigation bar to open the Navigation Drawer.
2. Tap the Gear icon at the bottom of the Navigation Drawer to bring up Settings.
3. Tap Mail.
4. Tap Notifications.
5. Tap Notification actions at the top of the screen.
6. Customize the first, second or third actions.