Add BCC in Magento Transactional Email

You can add a bcc in the code where you send the email:

Mage::getModel('core/email_template')
     ->addBcc('[email protected]')
     ->sendTransactional(...

This is the answer I've found:

 $mailTemplate->setTemplateSubject($mailSubject)->addBcc('[email protected]')
->s‌​endTransactional($templateId, $sender, $email, $cus_name, $data, $storeId);

You can do it in the config. Go to Sales > Sales E-Mails. Foreach transactional E-Mail you can enter Send Order Email Copy To and set the Method to BCC via Send Order Email Copy Method.