I would suggest, rather than unsubscribing, to change the subscription type to "no e-mail notification". This way you can still see the threads in your control panel, but you don't get all those e-mails.
You can do this in the user control panel, Edit options, Default thread subscription mode. For existing subscriptions, View all subscribed thread, select them all (the little check-box on the top right if the list), then select the change in the drop-down menu at the bottom right.
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