Recovery Email Address: This will send a verification code to the recovery email address you have on file. Noted: If you didn't receive the verification code in your inbox, check your junk or spam folder.
Authenticator App: You will use your authenticator app (i.e.: Microsoft Authenticator, Google Authenticator) to retrieve your verification code.
4. Click Next
5. Scan and provide the verification code it sent you and click Check to enable Google Authenticator.
Below example google authenticator code will show
Now, anytime you log into http://mail.yourdomain.com you will be required to enter in the new verification code.