Same here, I was just about to comment about this exact problem with TIAA specifically, after receiving yet another marketing spam email from them today.

For a while they all had a footer like "This service communication provides information about your plan benefits to help you make informed decisions. It is sent as part of our plan services and is not subject to communication preferences. Thank you." But today's spam didn't even bother with that song and dance.

It's infuriating.