Blocking Spam Bots
So I have a system set up on my forum that requires members to apply, and get approved by me, each member gives a reason why they want to join the site, real people give real reasons and spam-bots post the same meaningless comment every time, making them easy to find and prevent from ever joining the site. It works well, because it means they never get a chance to post anything onto the website before being found and deleted.
However, just lately it seems this system has stopped working, something has made these 'applicants' able to post their spam and junk onto the site's activity feed, and there's no way of restricting this in the users permissions area. Any ideas on how I can stop this happening? It's upsetting some of my real members.