I can't unsubscribe from notifications

How does someone unsubscribe from notifications that I don’t even subscribe to. The emails of notifications state:

You are receiving this email because you subscribed to a forum.

Login and visit the topic to unsubscribe from these emails.

  1. I am not subscribed to these notifications.
  2. How do I unsubscribe from ALL notifications?

This should be easy. Especially considering Mautic is a service that tracks and saves subscriber information. Front and center their own product should have an easy-to-use unsubscribe link.