But I think it would be very difficult or impossible to prevent scammers from registering accounts by verifying this email. But if it could be ensured that spammers could be unregistered by email then the balance of the forum would be well preserved. Scammers come to the forum by posting random posts in the forum to upset the balance of the forum. Although the moderator deletes the random post after seeing it for a long time but the scammers are usually there with some motive which is definitely not a good motive for the forum. But you'll be happy to know that scammers don't last long on forums.
The IP works perfectly and actually indicates to people that they have never been here before or that they can't register because it's banned from that IP.