Email App for Iphone 6+?

What is the best email app for the 6+? The native app is a pain to navigate with one hand.

I only have two email accounts so the labels are at the top of the page and difficult to reach. Then once you get into an account, the back button is way up at the top making me double tap to bring it down to reach it everytime I want to back out of that account.

Is there an email app with a layout optimized for one handed use on the 6+?

ETA - I have added mailboxea to bring the email accounts down on the screen, but would like a cleaner solution and something that avoids the top of screen back button.