I just started using Avast by downloading the latest version. My internet access is through ATT U-verse. I use Firefox to access Yahoo Mail. (pop.mail.yahoo.com). It appears that Mail Shield is not scanning my email because it shows 0 e-mails scanned. After spending a couple hours on this forum I "think" I learned that Yahoo Mail is Web Mail and therefore not scanned by Avast Mail Shield. Is that correct? Thanks