is there any chance you can change the sender-address of the Balance eMails (mainly Predictor)? The only thing you can change through the Web-GUI is the reply-to, but the sender stays at "email@example.com".
In our testing it seems that changing the reply-to email address will change the sender address. What version of Balance are you running?
I'm using OnCommand Balance 184.108.40.206, and changing the reply-to address just changes the sender of the alarm-mails. All Predictor-Mails still have firstname.lastname@example.org as sender.