go here: https://www.simon.com/mall-insider/unsubscribe
Alternatively you can click the Unsubscribe button in the footer of any email you receive.
To update your email address or change the centers you are subscribed to:
go here: https://www.simon.com/mall-insider/preferences
Simply type in your email. You will receive an email that contains a link to a page where you can update your preferences.