That's interesting. I haven't run across this before because I would just use BCC for such situations.
So you're saying that everyone who gets the e-mail EXCEPT your boss' boss sees everyone else who got a courtesy copy? Okay, I guess I can understand how that might be useful, but I don't know how it's being done, other than to send the e-mail twice -- once with the list in the CC field and once with no one listed in the CC field.
I guess your boss could achieve roughly the same functionality by forwarding the message to the list after it was first sent to his boss with an empty CC field.
In either of the above cases I don't think the boss' boss would be able to find out who had been copied unless s/he had access to either your boss' e-mail client or to the mail sending server.
But I think you may be suggesting that there is another way to accomplish this, perhaps in one shot instead of having to send mail twice. If that's so I don't know the method that's being used, so I don't know the answer to your question.
What OS and mail client are being used? What type of mail server?
- prosaic