Blue Mail is probably the best all-around email app out there. It features a simple interface, compatibility with virtually every email provider, and it just keeps things clean. There are also a set of smart settings that can help you customize your experience. It also comes with Android Wear support, the ability to lock up private emails, widgets, color coding, and a lot more. It’s powerful, simple, and best of all it’s completely free to download and use. People don’t write about it anymore, but it gets updated frequently and rocks a 4.7 out of 5 star rating on Google Play. It’s one of those Android apps worth your time.