If you ever wanted an e-mail app that works to remind you rather than have a multitude of apps to provide the same experience, then Mailbox may be the app for you. The app is developed by the creators of Dropbox and provides the functionality for iOS and Android. The interface is built around swyping to organize and get through e-mails. Short swyping right for example archives emails while long swyping right will delete the email. Swyping left will allow users to setup a reminder for that email later among various other reminders types.
The UI looks like a mix between iOS 7 and Android's HoloUI which gives it a very light look and feel. If Gmail is used, the app supports Gmail aliases to send and receive emails which can be added via settings. The app is very light on resources as well so performance should not be a factor along with nice transitions to make the app feel very much at home on Android.