Automatic copy of emails sent to another address

I have several work queues that use notification for sending emails. The emails get sent from the Mail work queue. What is the easiest way to have a copy of every email sent to another email address? Adding a notification to the Mail queue? Or another command?

Including a CC or BCC in every email? A command that would update the queue entry and add BCC before sending? Updating the SendMail command so an optional CC (BCC) could be set using parameter1 (that could be a Root model feature)?