When forwarding an email, only the TO recipients are added in the quoted headers. This means that the recipient of the mail does see all the recipients that got the email originally.

Email is a legally allowed document. It is very frustrating that I got into legal problems because I could not show directly that a specific person had gotton the mail as a cc recipient, because in the forward that person was then not visibile anymore as a recipient.
Please add cc recipients in quoted headers when forwarding a message. Or make optional to enable it.