I've settled on Airmail... Love it! – Airmail - Your Mail With You Review

There are a ton of options out there for managing your email on the iPhone, but once I started using Airmail I have come to love it more and more with each update. The swiping gestures, and the availability of a Mac OS app that works in a similar fashion has won me over permanently. And their customer support is outstanding. I had a question about notifications in iOS 10 and started a chat through the iPhone app and had an immediate and helpful response from Sarah... who is a real person, by the way, and not an FAQ web page. I've tried at least five other iPhone apps for email, but Airmail has won me over by a long shot.
Review by co-conspirator on Airmail - Your Mail With You.