It doesn't. I've recently had to add about 30 mail filters to keep all the weekly/bi-weekly area newsletters trumpeting every random "milestone" for every team

It doesn't. I've recently had to add about 30 mail filters to keep all the weekly/bi-weekly area newsletters trumpeting every random "milestone" for every team out of my main inbox. When it comes time for me to move on from the company, one of my antics is going to be to reply-all to each and every one of them with the word "unsubscribe."