E-Newsletter – UN subscribe

When i send a test newsletter and use the unsubscribe link at the bottom i get sent to the admin backend.

WordPress functioning is still new to me. Is it correct that a newsletter subscriber (assuming they are not unsubscribing as site user) gets sent to admin view? Is the idea that the person when subscribing registers to becomes a 'user' with an option to a 'subscriber'. How does this then tie in to Marketpress?