Not receiving emails

If you can't receive email on your iPhone, iPad, or iPod touch - Apple Support

Parkdale69 Said:

"Not receiving emails: I have not been receiving my emails for the last 2 weeks. What do I need to do to receive all new emails?"

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Two Things:

A. Contact your eMail Provider.

If the password is not going through, then contact your eMail provider to find out what is going on here.

and...

B. Use a New App Password:

Do you use an App Password? If so, try a new App Password. Sometimes, changes (i.e. updates) are made to the device, and then mail server syncing becomes an issue (which is what a new App Password it intended to fix). For example, go here for gmail: Sign in with App Passwords - Google Account Help - Google