You can set your device to notify you when you get an incoming email to one of the email addresses set up on your device. From the email notification in your notification panel, you can reply to the email without opening the app.
1.
From the Home screen, drag down the Notification panel.
2.
Tap your email.
3.
Tap Reply.
4.
Enter your reply.
5.
When you're finished, tap the Send icon.
6.
You've completed the steps!
1.
From the Home screen, drag down the Notification panel.