in your forum user profile, there is an option called "edit membership" - in Step 2 "Message delivery" you can choose "Web Only - Don't get notified of the latest happenings. Read messages only on the web." that way you won't get anything in your inbox and you can choose to just surf the forum messages as you please. Make sure to click on the "sort by date" header to get the view in chronological order, otherwise some stuff won't make sense