Email notifications are not working for some events like
1:Comments on items you were involved in.
2:Video created
3:User Joined the Group
4:New Discussions Posted
5:New Replies in discussions
6: RVMP not going to event
7: RVMP Going to an event
8:RVMP might be going to an Event.
Notifications on user accounts are working fine but Email notifications are not working for above occurances.