smtp_mailengine sets sender incorrectly

I"m not a Drupal wiz so the problem may be elsewhere, but at the moment in smtp.module:869 we have:

'from' => $message['headers']['Sender'],

At least in mimemail I never see 'Sender' added to headers, but the smtp_mailengine is passed a sender as part of the $message array, so this should maybe be:

'from' => $message['sender'],

That change was apparently required on my end to use the mimemail() method in my own code (along with SMTP Auth).