How to get notified when member ask question on forum under specific category

Hi Forum,

I want to know that how to do it

If any forum member put any question on forum under any category , if member has chosen for any category to serve community [ I dont know from where member can choose to do so] then he/she should get email if he/she want it.

We have enough on our plate hacking suitecrm without taking on the forum too :slight_smile: