Turn Reading Pane OFF to prevent viruses from spreading.
Most email viruses fire off when the email is actually opened. Having convenient based items like auto-preview or the Reading Pane on will allow viruses to spread. To prevent this from happening and lower the chances, please follow the below instructions.
  1. On the menu bar choose VIEW, then Reading Pane, then OFF. In most cases this will prevent viruses from executing on your computer.