Outlook doesn't have a built in method you can use to automatically include yourself (or other email address) in the BCC field when you send a new message. You can use Rules Wizard to CC and address but not BCC.
To BCC the message, you need to either use VBA or a utility.
Copy and paste the code from this page into
your ThisOutlookSession project. To do this,
click within the code, Select All using Ctrl+A,
Ctrl+C to copy.
In Outlook, press Alt+F11 to open the VBA editor
and expand Microsoft Outlook Objects then double
click on ThisOutlookSession to open it in the
editing pane and Ctrl+P to paste the code.
Don't forget to replace someone@domain.com with
the correct address.
Utility to always do a Cc or Bcc to specific recipients or to selectively copy the message based on filters the user sets. Does not trigger the Outlook security prompts. Enter code WD9BHK53 during checkout.
Use AutoBCC to automatically send a blind-copy of all your outgoing messages to another address, for monitoring team communications with customers or just to improve workflow. Free.
HiddenBCC is an add-in for Microsoft Outlook 2000/2002(XP)/2003 which enables you to automatically add a predefined BCC recipient to every outgoing message. Freeware version available.
To automatically Bcc all outgoing messages -OutlookCode.com