Gmailify

Gmailify links your existing account to Gmail so that you get all the bells and whistles—spam protection, inbox organization and even Google Now cards based on your mail—without having to leave your current address behind.
All you need to do is open the Gmail app, sign in to your email account(s), and enable Gmailify. And of course, you're always in control—so if you ever change your mind, you can unlink your account(s) at any time, and continue to access them through the Gmail app without using Gmailify.

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