A free program for Android, by Yahoo.

Yahoo Mail Go – Organized Email is a free email app for the latest Android devices. Use this app to easily organize multiple Yahoo, Gmail, and Microsoft Outlook email inboxes, so you can stay organized. With the ability to add custom folders, sounds, themes, and even swipe views, you’ll be able to customize your inbox to your personal preference.

Why use this app?

Yahoo Mail Go – Organized Email is an extremely lightweight and simple app. In addition to organizing your inbox, it also includes a tool that will assist you in unsubscribing from unwanted emails.