Restarting your email app should solve your issue. Alternatively, you can remove your problematic email account and reinstall it. Then, launch the Mail app and sign in. Wait for a few minutes until the Apple logo appears and then try the process again. This will solve most of the problems. Then, repeat the process to receive your email. It may take a few tries to fix the mail that is not working on the iPhone problem, but it's worth the effort.
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