First delete all email accounts from your IPhone except the one that you want to be updated without opening the email app. IPhone can only automatically update one email account without accessing the email app. Under settings on your IPhone, choose "mail, contacts calendars." Then choose "Fetch new data." Then make sure to set "Push" to the "ON." position. Then select the time window for checking for new emails, "15 min 30 min manually." Theoretically, your email app will check your email account or new emails every 15 minutes if you choose the 15 min option. The IPhone does not yet update emails every time you receive an email.
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