A banner introducing this feature appears once for each administrator, at login:
Email notifications about upcoming license expiration dates can be enabled/disabled here.
Select the link to open the Global Settings > Account Details page. If you select X to close the banner, it does not appear again. Use the following procedure to enable or disable notification emails.
If you want to opt out of receiving notification emails, set the toggles to OFF.
There is a toggle for your primary Email, and one for your Alternate Email. You can set one or both toggles to ON or OFF.