This is an Excel users group, but here's your answer from Outlook Help
Show or hide the Bcc field
You can display the Bcc (Bcc: An abbreviation for blind carbon copy. If you
add a recipient's name to this box in a message, a copy of the message is
sent to that recipient, and the recipient's name is not visible to other
recipients of the message.) box in all new messages that you compose.
In a new message, do one of the following:
If Microsoft Word is your e-mail editor
Click the arrow to the right of the Options button, and then click Bcc.
If Microsoft Outlook is your e-mail editor
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