A service like Stop Forum Spam might be a solution to this. It checks for IP address and email address and gives it a value based on how likely it is assumed to

A service like Stop Forum Spam might be a solution to this. It checks for IP address and email address and gives it a value based on how likely it is assumed to be a spammer. When they have to set up a new email account and maybe even a new IP address for every few accounts, it gets to be a lot of work soon. https://www.stopforumspam.com/ https://www.stopforumspam.com/