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Generally, viruses come as an attached file in your email. You have to open the email, and then the attachment may do the damage before you know about it. The best way is to turn the Viewing Pane off, so that mail does not open automatically, and when you receive an email that you are suspicious of, and not sure who it is from or where it has come from, Right Click on it, and view the properties. You can then view the details, see who it is from etc, without opening it and infecting your computer.