If the organization is legitimate, I find it usually works just fine. I usually only get such emails from organizations that I have recently started interacting

If the organization is legitimate, I find it usually works just fine. I usually only get such emails from organizations that I have recently started interacting with and that assume I want their newsletter. A simple unsubscribe fixes that. If I tagged it as spam, it would start to erode the ability of people who want this stuff to get it past the automated filters.