Add BCC to yourself on all emails.

I have a couple of customers that need to be able to BCC themselves on all emails for legal reasons. This is possible with advanced routing from the overall admin interface. It would be nice to be able to check a box off in their settings (or build a filter) that all emails from the user are BCC'd to themselves. Many desktop apps have this feature and doing so would alleviate getting the overall administrator involved in this task.