Coro is a phishing and malware protection system that monitors your Harding Gmail.
It is an EXTRA LAYER of protection over and above the protection Gmail provides.
Emails suspected as phishing emails are sent to a "Suspected" folder in your Harding Gmail.
If you want to flag an email as a phishing email (and Gmail missed it):
Click on the Coro icon on the right side of your Gmail
Click on the "Report Phishing" button