unless the sender or the receive asks for it to be posted in a specific scam accusation thread.
That creates the same problem: I can't know who the receiver is if they were in a BCC. And even if there are 2 known receivers already, there could always be a third in BCC.
I just thought (@icopress) of another use case: Say you're running
Awards, and you want to keep entries confidential until a certain date. You could require all participants to PM you, with a CC to "LoyceVs PM publisher" and delay=<days left>. That way the campaign manager can already see the entries, and once the contest ends, anyone can verify all entries.