Managing Incoming Mail in Gmail
Once you’ve read a Gmail message, it’s time to decide what to do with it. At the bottom of your screen when you’re reading email, you’ll find four buttons that can help:

Archive. This button appears if you haven’t given a label to the email. (See Working with Labels and Search for details on adding labels.) Tap the button to archive the message. It vanishes from your inbox, but still appears in All Mail.
Delete. Sends your email to the Gmail Trash. The mail will be available in the Trash for 30 days, so you can always view it there. But after 30 days it gets deleted forever. When you delete mail, you see a notification at the top of your inbox, telling you how much mail you’ve deleted, and allowing you to undo the deletion—in other words, take the message out of the Trash.

Forward. Opens up the next piece of email.
Older. Opens up the previous piece of email.
That’s just the beginning, though. Tap the Menu key, and you’ll have these options:

Change labels. Even if you haven’t applied a label to a piece of mail in your inbox, it already has a label pre-applied to it—Inbox. Tap this button to change the label by adding more labels to the message, or taking away ...
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