vojtech
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Which mail program do you use ? Is it configured for avast mail scanner ? You can use the Mail Protection Wizard for configuring some (not all) mail programs or configure manually according to the help.
Mail scanner should catch a virus when downloading a mail before the mail program receives it.
Standard shield should catch it when starting the file, if you use ‘Normal’ setting. If you use ‘High’ or ‘Custom’, it can be caught also when opening the zip or unpacking the zip, according to exact setting.