How to fix email account?

Remove your email account and set it up again

Make sure that all of your emails are there or make sure that your email is saved somewhere other than your device. On your device, go to Settings > Mail, then tap Accounts. Tap the email account that you want to remove. Tap Delete Account.

If you can't receive email on your iPhone, iPad, or iPod touch ...

If you can't send an email on your iPhone, iPad or iPod touch

1. When you make an iOS or iPadOS backup in iCloud or iTunes, it backs up your mail settings, but not your email. ... 
2. Make sure your device is connected to the Internet.
3. Check with your email service provider to find out if there's a service outage.

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If you can't send an email on your iPhone, iPad or iPod touch ...

Sillybille Said:

"How to fix email account"

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Use of an App Password:

Do you use an App Password? If so, try a new App Password. Sometimes changes are made to the device (ie updates), and then you need a new App Password.

See How AOL Uses it:

Here is how AOL uses an app password: Create and Manage Third-Party App Passwords - AOL Help