Log in to the Sinch Customer Dashboard and select the Notifications option (highlighted in red below) from the Settings menu on the left panel. The notification page is displayed:
This page allows you to add, remove and edit the users who receive e-mails for different updates from Sinch, including:
Sinch has a new single sign-on login experience that will allow you to seamlessly login to any existing Sinch services that you may use - Learn more about Sinch ID.