Under Newsletters in your folders you see what you signed up for.
- Tick what you want to get rid of.
- Choose what happens to the old mail.
- Press Unsubscribe.
The Unsubscribed tab shows what you unsubscribed from. Do it yourself lists the senders we cannot unsubscribe automatically; there is a button to their own page. There is also an unsubscribe button above an opened newsletter.