> Your attitude doesn't account for the possibility that since you do business with somebody, you need or want to receive some of their emails.

You are incorrect and interpreting my comments very narrowly.

Doing specific business with somebody should not give that somebody carte blanch to use my email address for whatever reason they wish. I absolutely can be ruthless in eliminating aspects I don't like and if businesses don't like that: tough shit. My world doesn't revolve around your business. If that means that the business relationship ends right there, then I'm better off for it.