I originally replied to comment stating:
> Yeah no. Emails which include an unsubscribe link are legit enough to not do that. Actual spammers don't bother to include an unsubscribe link.
I found a phishing email with unsubscribe link. Thus I think we can generalize that emails containing unsubscribe in general are not legit nearly enough of times to trust that. Thus only correct and safe way is to mark them as spam and let the email provider eventually to handle them correctly for everyone.