Drupal Association members fund grants that make connections all over the world.
In my messages I added a CC address
$message['headers']['CC'] = $ccaddr;
Both the From and CC user received the mail, but the CC user didn't show up as a CC. When I checked the code, both CC and BCC are being adding to the PHPMailer as a BCC.
I believe line 435 of smtp.module should become
Making that one line change fixed the problem for me.