To select an email for deletion/flagging as junk without having it display in the preview pane, simply hold down the control button and then select the email(s) in question. You can then flag it as junk or delete it without fear of opening a potentially malicious email.
Alternately, you may wish to enable check boxes next to the messages within your Inbox. To do so, please follow these steps:
- Click the "Preferences" link in the upper right corner of the email screen.
- Click the "General Settings" link under the "Email" heading
- Click the "yes" button next to the option marked "Use checkboxes to select emails"
- Click the "Save" button in the upper left corner of the "Preferences" module