Almost every paid AV and some free AVs have mail shield/guard service. And many users of those AVs also using web-based mail service like Yahoo, Hotmail, Gmail, etc. These web-based mail service all have Enterprise level AV scan emails. So my question is: do we still need mail shields/guards on our AVs? Isn't enterprise level AV superior than personal level AV? well, to make things easy , lets say we dont use outlook and its likes, we only use Yahoo/Hotmail/Gmail.