anti spam advanced rules

To be some more in control we would like a feature to bypass the default behavior on spam detection to set this up per rule. Not only the score but also what to do, like a firewall rule. This way we think it could be possible that on certain extentions we can mail; this extention is not allowed, please use xyz or forward the message on softw failure instead of the 2 options now (it is spam or it is not spam)

It requires a post processor that takes decisions ("what to do") on incoming mail based on some rules