New answers tagged discussion-board
If its per discussion item, you could use the Alert Me option on the item and add your colleagues in the Send Alerts To field. Set alert on a List Item add alert video Please try the above steps in your Discussions Forum item.
I used discussion board for a notice-board and I had your same problem. To resolve it, I added a boolean field to le list. ( Archived) Then I deployed a custom web part to show the notice not archived. A daily timer job was updating the item. (I used expiration day). Hope it helps ;)
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