Bcc actually has two functions:
(1) To hide recipients.
(2) To stop replies, i.e. working as a kind of "Non-Reply-To".
good point. I've certainly used Bcc: in that way. of course, it has
the unintended side-effect of hiding those recipients from view by
other recipients.
If IETF had standardized a new header "Group-Reply-To"
(similar to "Follow-Up-To" in Usenet News), and if all
mailers would by default use these names when people used
the "reply-to-all" command, this would have been better.
IMHO, To-noreply: and CC-noreply: fields would be far better. sending
MUAs would use them to generate envelope recipients just as if they
were To and Cc. receiving MUAs would display them, but not send
replies to them.
Keith