The sample code at http://www.outlookcode.com/d/code/autobcc.htm shows how to add a Bcc recipient using the Application.ItemSend event in Outlook VBA.

Signature
Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003
http://www.turtleflock.com/olconfig/index.htm
and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
>I need to create a rule for certain incoming email messages that will forward
> Bcc to an existing Distribution List. Looking for a way to do this in
> Outlook 03 or I'm open to other software that will allow me to do this.
>
> Any help, advice, guideance will be appreciated,
> BC