I am using Postfix in combination with RBL, the problem is that one of my email addresses is forwarded via another domain, so the connecting server delivering mail for this address to me will never be on the RBL as it is a valid server. Is it possible to have Postfix looking into the headers to see if any of the mailservers in between is on the RBL so it can be dropped anyway? I am quite attached to this e-mail address as I use it for years already. But unfortunally it has become the biggest spam-catcher as well. 