This is good news, because it will definitely help to make this a safer place. Nevertheless, I would love to get an answer: what is the point in blocking existing addresses? This is a serious disadvantage for all existing members, and it would help to know a reason why we should take it. I guess you can block certain addresses for log-in. Blocking old ones only makes sense to keep forum terrorists from loggin in under a new fake address, and then change it back to their real old one. But why can't you just prevent this - whenever a terrorist changes back to a known evil address, throw him/her out again. And do they really switch back to a known one, when they only drop in to cause trouble!?? You are going to punish 100% of friendly members, and you will cause 0% trouble for the nasty ones, I'm afraid.