Earthlink (SBC Global) vs NAV on Mail Virus Detection

I had a problem with Earthlink (EL) recently, and their technician thought it might be solved if I disable NAV from checking my in/out mail for viruses. I balked, and he replied that their checker does that. Comments? I'm about to move over to SBC Global with our recent installation of DSL. Any comments on what mail protection they might provide?

Wayne T. Watson (Watson Adventures, Prop., Nevada City, CA)
(121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
Obz Site: 39° 15' 7" N, 121° 2' 32" W, 2700 feet

"Humans aren't the first species to alter the atmosphere; that
distinction belongs to early bacteria, which some two billion
years ago, invented photosynthesis.
-- Field Notes from a Catastrophe, E. Kolbert

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