Can we use sendMessageFile from nsIMsgSend to avoid going through the Outbox?

[jikamens]

Saw this in a recent message on the add-ons list:

I'm using sendMessageFile() from nsIMsgSend. This function takes a nsIMsgCompFields object which contains the 'To' and other information. The function uses this information to send the message, not the headers from inside the message.

Need to figure out if we can leverage this in an experiment to avoid using the Outbox!