Zoho Mail, a suite of email apps that includes Email, Calendar, and Contacts, is the best.
Top Features
Multiple account support – Add or switch between different Zoho email addresses. You can also view all of it in one place through the unified Inbox and push notifications.
Conversation view – Keep up with email threads that are long and have related messages grouped together.
Optimized to Tablets – Zoho Mail has been optimized for Android Tablets with various form factors.
Swipe actions that are quick and easy – Easily archive or delete email messages with customizable swipe actions.
Advanced search – Access your inbox in seconds using auto-suggestions, handy filter options and advanced search.
You can work offline – Create and send emails even if you are not connected to the internet. Emails will go out as soon as an internet connection is available.
Integrated Calendar – View/plan your appointments, accept invites and more from within your email.
Contacts on the move – Filter and keep track of your contacts via Email or by calling.
Streams – A place to Collaborate and Socialize, as well as Integrate. You can have productive conversations without long emails. This will change the way you communicate within and between teams.