"new question email" for Q&A user on mult-site

Hi,

I'm teaching two classes: Class A and Class B.

I'm using a multi-site install of wordpress to accomplish the following:

Q&A list for Class A ---- (www.courses.com/Class A/questions)
Q&A list for Class B------(www.courrses.com/Class B/questions)

All students are registered to the network.

In addition,

A student in Class A is a "registered member" of Class A
A student in Class B is a "registered member" of Class B

Goal
I would like a student in Class A to receive an "email notification" anytime a new question is asked in Class A. Ditto for B.

Current setting:
Dashboard Class A site -> Student A Edit User Profile Page : Q&A settings - "Get e-mail notifications about new questions" radio-button is checked (yes)

The Good
If a student in Class A asks a question on Class A - Q&A, Student A gets an email notification.

The Bad
If a student in Class B asks a question on Class B - Q&A , Student A receives an email notification of this question.

Question:
Can I keep "The Good" and get rid of "The Bad"?

Thanks a lot,
Curtis