When you subscribe at the top level you should get mail for posts in all sub-forums.
However, the subscription options can affect how much mail you get:
xxxx Forum
[ ] Receive every message posted in the forum.
[ ] Receive new topics only.
Subscription Format
[ ] Individual emails (you can reply by email)
[ ] Daily digest
If you checked #2 rather than #1 then you won't see any replies. That might be why you thought it was working, but now you realise you are not seeing the replies?
Volunteer Helper - but recommending that users move off the platform!
Once the admin for GregHelp now deleted.