Although the Email app has fewer message-management options than a typical PC or Mac email client, you can manage message list clutter by deleting unwanted messages, moving messages to different folders, changing the status of messages from read to unread (and vice versa), and flagging important messages.
You can delete messages while you’re viewing a message list or reading a particular message using these techniques:
• While reading a message, tap the Delete icon at the top of the screen. Note that such deletions currently happen immediately—without requiring a confirmation.
• While viewing the message list, ...