I'm not sure what exactly marking as "spam" will do so I'll bring it up here first. I just got 15 spam messages from one IP address on multiple blog-posts. And by spam, I mean links and promotions for various drugs and beastality sites. I can send the IP address along if it's possible to block future comments - I haven't moderated any of the comments yet so they're still sitting in my queue. Or tell me how to block them myself