Philip Hazel wrote:
The issue of who handles Bcc: header lines has again been raised, and I
am seeking opinions as widely as I can. The requirement is
straightforward: non-Bcc recipients of a message should not see the
addresses of any Bcc recipients, that is, their copies of the message
should not contain Bcc: header lines.
The MUA, however it is constituted, should handle all BCC processing, 
and the cloning of messages with and without the Bcc: header.
IMO, each Bcc: recipient should receive a copy with the Bcc: header for 
themself and only themself. No other copies should mention that Bcc: 
recipient.
        Tony Hansen
        tony(_at_)att(_dot_)com