Mail is not working on my iPhone

Try logging in to your eMail account (eg: Yahoo, Gmail or etc.) directly online. Your current eMails are likely available to you immediately, there.

If you use Gmail: There is a Gmail app available in the App Store (link below: iPhone and iPad) if you do not have this already:

https://apps.apple.com/us/app/gmail-email-by-google/id422689480

To troubleshoot eMail in the Mail app on iPhone:

What to do: If iCloud Mail isn't working

or

There is a "Get Support" link for Mail Support online (link below)

Mail - Official Apple Support

doryn177 Said:

"Mail is not working on my iPhone: My email is not working, my iCloud is not receiving or sending messages, and I have important messages from my attorney that I need to open. but I have not yet received"

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Troubleshooting iPhone Mail:

Create and Use an App Password:

Note that you would need a new App Password, being that Mail is a third party app. You cannot log in using your eMail address password. As an example, go here for Hotmail: Manage app passwords for two-step verification - Microsoft Help