I have not tried Following at the level you are describing. I am using Following on the MOSC place but not at the post level, only on spaces and sub-spaces. In Preferences I set email All Activity for Followed Activity.
I have Follow set for My Oracle Support Community and it seems that I am receiving all posts within the MOSC.
Today I received an email for Re: Maximum Size of a DIMP file in POS system
cookie crumbs for that post are:
All Places > My Oracle Support Community > Retail (MOSC) > Retail Point-of-Service Suite (MOSC) > Discussions
In the above list only My Oracle Support Community shows Following.
avatar > Places > Following
for "Retail" and it returned "No results found"
I remember seeing something about the Follow setting not being inherited but I think I am receiving an email for every post anywhere except for my own posts.
My normal routine is to save deleted email for 6 to 7 weeks. Tomorrow I will post a count for the month of February.
How are you testing whether Follow is working or not?