Multiple 'Reply to' email addresses

We are sending customers email addresses that appear to be coming from their Reps.  We are setting the Reply To email address as the Rep's email, but would also like a copy of any replies to go to another inbox as well.  Is there a way to have two Reply To email addresses? Better yet, is there a way to do that and make one 'hidden' so the rep only sees the one address?

Thank you!