The drop down has three values:
Do not subscribe
No email notification
Immediate notification of new posts by email
I suggest a new option
Immediate notification of new posts to your posts only by email
Sometimes I am not concerned about what others might be posting.
When someone is responding to my post, then I want to know.
Joe DBA creates thread "What do I do now?"
I reply to his thread with my suggestion.
Now 10 other people also reply to his thread.
Finally Joe replies directly on my post.
I would like to only get an email on joe replying to my post. I don't really want to know 10 other people added their suggestions to his question.
Often when that happens I remove my subscription to that thread.