Suomispam is a reputation database originating from Finland and aimed to list IP's that send spam in the Finnish. They point out that large lists are not efficient in filtering spam from smaller countries and less spoken languages.
They are very gracious in decision to list and may give time to the managers of the IP to solve their problems before listing them. They will also delist the IP if they see that the problem has been solved.
This gray list is their pre-blacklisting list to not directly block out.
Is the information on our site wrong or incomplete? You don't want us to monitor your blacklist? Or do you operate a similar blacklist? We would like to hear from you!