This actually seems like a great idea. I remember reading that your spam score is in part based on email open rates, by dumping users who have no chance of open

This actually seems like a great idea. I remember reading that your spam score is in part based on email open rates, by dumping users who have no chance of opening you decrease your likelihood of getting blocked for a campaign. It also has the nice benefit of publicity and reduced mailchimp/other provider fees. On second thought, I'm not sure if any of these would offset the cost per acquisition of even a few users who were accidentally "let go" by this tactic. I hope fab posts some statistics at some point.