This document describes among other things, network security systems that incorporate a feedback loop so as to automatically and dynamically adjust the scope of network traffic that is subject to inspection. Risky traffic can be sent for inspection; risky traffic that is demonstrated to have high rate of threats can be outright blocked without further inspection; traffic that is causing errors due to protocol incompatibility or should not be inspected for regulatory or other reasons can be flagged so it bypasses the security inspection system. The system can operate on a domain by domain basis, IP address basis, or otherwise.