system
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Midway… I understand your confusion
Most antivirus software programs, and Avast included in this, cannot scan webmail. They cannot do so because of the difference in how mail is handled with POP3 and webmail. With webmail you are only ‘viewing’ the mail ‘from’ your webmail server. With POP3 mail you are actually downloading the mail “to” your computer.
But… do realize that as Eddy said earlier, all files that come to your system… be it from the web, or cd, or a floppy disk, etc etc etc, no matter the fashion , the on-access scanner will catch them should there be an infection.
I hope this helps 