Spam email is generally from someone trying to sell you something. If you don't recognise the message title or sender, either just delete the message, or if you're curious about what it is, highlight the message in your Inbox, right click and select Properties. In the Properties box select the "Details" tab and click the "Message source" button. You will then get a pure text version of the message which will let you see the contents without any risk of infection if it is malicious.
You must be a different version of OE from mine. I have version 6, and as I use Mozilla Thunderbird I don't bother to update OE. Whatever version you have, it should include the ability to show the message source somewhere but I can't tell you where.
You must first disable the preview pane, if you do not, clicking once on an e-mail will open it immediately.
To disable preview pane go to view/layout and remove the tick in Show preview pane. To open mails now you have to double click on them, you can click once and then right click to follow Gongoozler's advice.
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