Something to consider, how about having the ability to delist domains?

I have a few domains that I use as pre-spam filters so that I can see immediately if my email address was spammed. e.g., I receive an email addressed to sun.com@myhappydomain.com but it's advertising something along the lines of rutabaga hentai.

If I could remove myhappydomain.com completely, that would be a happy making thing.