Over at the left, you'll notice a report msg link. That is a Report Spam function but requires manual intervention by a Moderator. It's been there for at least a few years I think. I'm sure many miss it just like the recommend link that appears at the bottom of each topic. Some things need a little more play around here! :)
The current report msg function would now become automated so that questionable replies can be arrested and reviewed by staff for further action.
<added> jatar_k beat me to it. Aren't you supposed to stay out of these topics?! :)