Sorry about the issue, there are few issues with mail server we are working on fixing it. When user creates a question, Portal sends the email only to user who creates it. Once you comment on that thread, you are subscribed & then you start to get emails.
This is very confusing. It would save me a lot of time if I didn't have to answer the questions posted on the forum, since there are so many experts over there. I supposed that only the questions that were sent twice to me were posted on the portal, which is not correct. I try to moderate the Jive forums, watch that no question is left without an answer. Maybe it is better not to do that anymore.