I don't know why I haven't seen anything on the myBB news but it seems that Facebook email has been released! Your email address becomes your page name ie. facebook.com/JohnDoe then firstname.lastname@example.org will be your email address.
Mine seems to be working great, all messages from friends show up straight away and messages from groups show up in a Folder called other! pretty awesome
In addition, if your cellphone number is setup, you can send the person an SMS as well at no additional cost.
Has email been activated on your account?