I created several "To-Do" items with the checklist feature in an issue and then I tagged people in these To-Do items.
My understanding is that tagging people (@-ing them) would trigger an email notification to them. However, no one has received a notification, why is that? 
I double-checked by tagging myself and confirmed that I don't have a notification from the tag. My personal notification settings do show that if someone mentions me, I should get an email so it is clearly not a notification setting issue.
