Bcc Journaling
Bcc journaling is really simple journaling on steroids. No additional UI is
exposed to turn on Bcc journaling
functionality. Instead, in the HKEY_LOCAL_MACHINE\System\Current
ControlSet\Services\MSExchange
Transport\Parameters registry subkey,
you need to specify JournalBCC
(REG_DWORD), with a value of 0x01
to enable and 0x00 to disable.
Restart the SMTP and Exchange
Information Store services to pick up
the change. When the Exchange store
detects this registry value on startup,
it enables capture of the Bcc recipients
on journaled messages and records
this information in the journal copy of
the captured messages.
Caution: Make sure that all your
Exchange servers have the necessary
upgrades for the level of journaling
you use. If you use Bcc journaling on
one server, make sure you enable it on
every server that has message journaling enabled. . . .

