This is a fantastic idea - congrats murtza! Our little startup does something in the same spirit, but for various types of junk mail (including magazine/catalog subscriptions): <a href="http://www.paperkarma.com" rel="nofollow">http://www.paperkarma.com</a>.<p>Basically you download the smartphone app, snap pics of mail you don't want, it/we figure out who sent it & unsubscribe you.<p>(apologies if posting this is uncool. not sure what the protocol is. lmk & i will delete...).<p>Cheers.