how to get to archived messages

I'm seem to have lost the email i had saved on how to search the list archives for some old messages. I'm looking for some info on some suggestions on firewalls an how to set them up. I know there was something in the past week or so on this. I wa hoping to get a good firewall device here at work but my boss thinks what we have in the netgear router is good enough for us. but i disaggree. i'm seeing way too much spyware an other traffic on the network an need to lock things down more so that we do not take such at preformace hit on the network. at times I see our dsl modem lights just flashing away with traffic. I need something to maybe monitor what some of that traffic is on the lan . thanks jack