My inbox disappeared last night and can't receive messages. My junk and trash are still there. This inbox/email was one that was on my 5s when I purchased it.
Have you tried deleting the email account in Settings, then add it back in?
Completely shutting off the phone and then restarting it can often fix these kind of issues. If that doesn't solve it and bring back your inbox, Ledstepln's suggestion of deleting/re-adding the account should do it.
Everything is fine now. Thanks
Turning the phone off then back on will not fix this. You have to delete the mailbox as noted by another commenter and then add it back. Thanks for the information