We've had a problem with spammers using .biz domains as an email. Most are automated Spam Machines. Don't feel bad if you have such an address and you are rejected. Please even if you have this type of domain, go get a Yahoo or Google free email account and join this way. Until this problem ceases we will not approve anyone at some of these .biz addresses that we can't resolve.
Gregg Lengling, Admin/Moderation