When I started getting summary emails from the forum, I clicked on the “click here to unsubscribe”. The link returned a 404 Not Found page. I got in to my settings to turn off the emails, but it would be nice if the link worked.
Sorry for inconvenience, we have just applied a workaround for emails which go with wrong unsubscription URL. Also we disabled automatic digest emails. Feel free to ask the team to tune your profile settings.