I have not figured out how to respond to those emails sent in that manner. There is no return address; except back to CZ. I wonder if the sender has not opened their email permissions. I have had a few that have a respond email address.
Inbox contacts are bad too. Most messages don't allow me to respond; because the sender has not allowed contact. I wish that function would go away; or not allow senders to contact; unless they give permission for response.