Do not open any email message with an attachment called ‘POSTCARD FROM HALLMARK,’ regardless of who sent it to you. It is a virus which opens a postcard image, which burns the whole hard disc of your computer. If you receive a mail called POSTCARD even though sent to you by a friend, do not open it. Delete it then shut down your mail reader then restart your computer immediately. It has been classified by Microsoft as the most destructive virus ever. So watch out there is a virus about.