At least one from this list must be present.
bcc [ Resent-bcc ]
- Some systems show the bcc list only to the author; others show the bcc list to everyone on the bcc list
Class quiz: What do we mean by ‘systems’ here? Is it the MTA or the MUA that hides the bcc list?
A: It could be either the MUA or the MTA on the sending system.