I first want to say that I love your node mailer, it is fast and very versatile, it fits my needs very well. My only issue with your mailer is that it does not currently support BCC (blind carbon copy) as one of the fields. If you could add this, I would be elated!
I think we can do this, I'll get back to you soon.
This is currently being implemented in http://www.nodemailer.org/ mailer. Perhaps that source will be useful to you, thanks for the quick response.