If I'm running ZA (free version) along with 2 other PC's, all hooked into a 4 port Linksys router to a highspeed modem, should I have my ZA Internet security level at Medium or High?
I've been recently having trouble with ZA blocking my email (G-Lock SpamCombat), and was wondering if having the ZA Internet setting to high isn't redundant (or even troublesome) if the router's firewall is supposedly making me invisible to the internet anyway.
Anyone have any thoughts on that?

Operating System:Windows 98-SE (Second Edition)
Product Name:ZoneAlarm (Free)
Software Version:2.x