In my case, the problem was that during testing (for the CC and BCC addresses) I was using the same email address as the target address I was (expecting to get three emails). It appears that my ISP's mail system refuses to send duplicate emails. Also, as a variation of this problem, if I used email addresses for CC and BCC that are defined as aliases for a real address and use the real address as the target email, the ISP's mail system again sees these as duplicates and doesn't send them. Once I started using three different, "real" addresses I started getting the CC and BCC. Hope this is your problem also since it's an easy fix.
