I know this may be a bit backwards, but I want to block smtp trafficout throught the local interface. The SME machine is a server/gateway that accepts mail then forwards it onto an internal box, I am having an issue with visiting users that intentionally or otherwise are sending out through the smtp box, I need to stop that. the other machine doesn't accept un0authenticated smtp so it cant be used in this manner, the SME machine can and I NEED to stop it.