It sounds like you have the preview pane open. It it considered risky to have this as an email, which may contain a virus, will open on it's own.
To 'turn it off' Open OE >View >Layout and untick "show preview pane" and click OK.
Alienware 17 R4 2017 review
These brilliant Lego posters show just what children's imaginations are capable of
Mac power user tips and hidden tricks
Comment réinitialiser votre PC, ordinateur portable ou tablette Windows ?