This provides access to a RBL type system for forum admins, listing known spam IP / email / usernames. The RBL database is provided by www.stopforumspam.com
. You do NOT need an API key from the website in order to access the database. only to submit data if you should wish to do so.
At the point of user registration, the mod checks if the IP number / provided username / email addresses appear on a block list and can block the registration.
Whilst this isnt the most perfect way to stop all forum spam, its another step that spammers have to overcome.