PatrickDeese said I would venture to guess that your forum is being subject to automated spam, and that ths has nothing to do with the Google rater hub.
Perhaps they have links to a website in their forum profile or something and they just send a bot to automatically post questions that will lead to their target site getting links.
Thanks for your reply. Yes this is what I thought when the forum messages started but that doesn't explain the emails. Those who have been booted may want to check their emails and responses. I'm becoming more aware of the possibility that these two (eval.google.com and emails) things are connected.