4 Mail Swipe Customization
So you know about swipe to delete, but did you know you can customize swipes for the Mail app in iOS?
Simply go to Settings > Mail > Swipe Options and you can specify what options will be available when you swipe left or right.
Additionally you can choose whether a message is deleted or archived. To do this, go to Settings > Accounts & Passwords > (Select an account name) > (Select the account again) > Advanced. Here you can customize mailbox behaviors, choose where discarded messages are sent, and specify how long deleted messages should be kept.