How do I get rid of imap.Gmail cannot be verified from popping up

Remove your Gmail account from the Mail app and set it up again. If you still get the message after that contact Google support.

BlueRican Said:

"How do I get rid of imap.Gmail cannot be verified from popping up"

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Try a New App Password:

Try creating a new App Password. Your App Password may need to resync - something typical after update installations. You would log in using that password, rather than your eMail's password. See if it then works.

For Gmail: Sign in with App Passwords - Google Account Help - Google