Maestro is a great mail client for Windows Phone that aims to offer a better mail experience to Windows Phone users. It has been through a long Beta trial and seems successful completion of Beta testing has made the devs to release the stable version. Now, great news is that it has been offered as free download for first 24 hours. So, get it till the offer lasts.
Introducing Maestro: a better mail client for Windows Phone. With unique features like account themes, gestures, and favorites, Maestro helps you manage your inbox quickly and efficiently.
-Gestures (Swipe to Delete, Archive, or Reply)
-Multiple Accounts with Linked Inbox view
-Fast Account Switching
-Support for Gmail, Outlook, and Yahoo Mail
-Label Support for Gmail
Thanks @LumiaManOfSteel for the tip. Cheers!!