For people that simply want to ask a question and don't want to register I have left registration non compusary. Every time we are spammed I ban the whole IP range of the spammer, but it's a loosing battle, they simply hijack other mail servers and get their spam bots (it's all automated, there are no actual people doing it) to spam me from there. The only reason they do it is in the hopes that google and other major search engines see it and rank their pages. They used to register and then spam from a registered account, but I vet all registrants now and rarely let people become members that are based in China, Korea, Russia, the Ukraine and several other No.1 spam lands. I delete it straight away throughout the day, so there is probably lots of spam that only I see!