system
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Is your PREVIEW PANE option in Outlook enabled ? If it is, you may wanna try to disable it. That way, if you have preview pane open in Outlook, your messages are “open” as soon as you click on them. If you disable preview pane, you will have to double-click on messages to open them in new window, but at least, your messages won’t be scanned as soon as you click on them… Having Preview pane closed is always good additional precaution from opening some suspicious attachments… just by looking at mail subject and sender of the mail, you can easily decide do you wanna open it or just erase it…
Cheers !