Apple Mail in iOS 11 has some overlooked nifty features. Among them:
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Fast Unsubscribe: emails with unsubscribe links will now automatically have them displayed at the top of each message with an easy to hit button.
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Unread Only: when viewing your mailbox, look for the filter icon (bottom left corner) and change the default setting to “Filtered by: Unread.”
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Quick Actions: Swipe left on a message in the new threaded view and it will reveal quick actions such as flag, reply and trash.
(This how-to is based on my experiences and info on Apple’s support pages — where the images sometimes come from.)