Within Natural HR, there is the ability to log in to your user account using an email address which is hosted within Google Mail.
In order to set this up, you must first ensure that an email address is a valid email address with Google Mail.
Setting up Google Single Sign on
To enable Google single sign on from within an administrator-level account, you will need to go to Administration > Company > Settings > Security settings and make sure that the "Allow Google login" field is set to 'Yes'.
Once submitted, you will need to make sure that the user name for the employee's user account is set to using the google-registered email address.
(Accessed via People > Users)
Once submitted, on the login page you will need to select the Login with Google button as opposed to entering the username and password to access the system.