Great question to ask about turning off email notifications for a certain topic on the OVO online community.

If you're no longer interested in a particular topic and don't want those email notifications when there's new activity, you can unsubscribe from that topic. Just de-select  ‘Subscribe’ at the top of the topic, below the original comment alongside ' Like', 'Quote' and 'Share':

An un-filled in star will mean you’re no longer subscribed to receive email updates for this topic.

Hope this helps.