You can add an additional email notification for a client on the client edit screen. However, when adding notes on a ticket and choosing email, it only shows the main ticket contact. It LOOKS like it is only going to one particular person. When a tech sees that it seems like you are communicating specifically with one person. However, there could be one (or more) other additional email addresses that are getting notified. This can be critical if you email something from the ticket that shouldn't necessarily be shared with others because you really can't tell that from the ticket.