Organizations using Microsoft Exchange Server 2003 can take advantage of its envelope journaling feature to send all messages, along with all recipient information ensuring complete and accurate archiving of all electronic correspondence for compliance with government regulations and corporate standards.
In Microsoft Exchange 2003, journaling is enabled at the mailbox store level. Configuring envelope journaling allows messages sent to the journaling mailbox to retain complete recipient information including Bcc recipients. Refer to the Microsoft TechNet article How to Enable Journaling for a step-by-step procedure.