Show Hide And View Bcc Box. In the Bcc box add recipients compose the message and choose Send when done. If you reply to an email message directly from the Reading Pane in Outlook 2013 2016 or 2019 Microsoft calls it Inline response you will find the Show Fields group with the Bcc button to the right on the Message tab.
If you dont see Bcc see Show hide and view the Bcc box. Select View all Outlook settings. It is quite easy to always show the Bcc field in the new replying and forwarding email message windows in Outlook.
If you click on the options tab - you should have and option to Show BCC and this will add the BCC box to your mail for you to add the address.
From their just click on the View menu in a compose window and select All menus. From their just click on the View menu in a compose window and select All menus. Select Save to apply. After you turn on the Bcc box it appears every time you create a message until its turned off.