Make sure that your phone is connected to the internet, and that you have the correct password for your email account. If you have the wrong password, it won’t load anything. Are you using iCloud mail? If using gmail, contact Google. You can also try sending your self an email and see if it appears, and log in on a computer and see if there is anything there. If there is, it’s your phone. If there is not, it’s the email server.
My 6s just randomly deleted every message I had in my inbox, I restarted the phone a few times & nothing came back
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IPhone 6s deleted all my message