Visit: https://sweepsouth.com/accounts/profile/info/
Here you will be able select whether you would like to receive newsletters or not by ticking/unticking the box. Note that you are unable to edit this setting via your app.
Alternatively, click the Unsubscribe link at the bottom of any of our newsletters or click this link.
This won't prevent you from receiving confirmations, invoices, and important stuff like that.