Hello James,

at the moment the only protection against spam in WebsiteX5 evolution 9 is the captcha that you've already used.

Im afraid that with this method the spam is not controlled 100%  and there is nothing I can do to help you about it at the moment. 
You can, if you wish, post an idea for our WebSite X5 creators and tell them to add more functions to improve spam filters.

Thank you for understanding