Email messages that you write in Microsoft Outlook 2013 can be sent to more than one person at a time. The most common way to do this is by adding additional email address to the CC (carbon copy) field at the top of the message window. But Outlook 2013 also permits the use of the BCC (blind carbon copy) field.
When you include an email address as a CC, everyone that receives that email will be able to see the addresses in the CC field. However, the BCC option will hide the email address of other receipients. Outlook 2013 does not display a BCC field by default, however, so we are going to show you how to display it with the guide below.
Display the BCC Field When Writing Emails in Outlook 2013
The steps in this article are going to change a setting on your “New Message” window so that a BCC field is always available. This setting will apply to every new email message that you write in Outlook 2013 until you turn it back off.
Step 1: Open Outlook 2013, then click the New Email button to start a new message.
Step 2: Click the Options tab at the top of the window.
Step 3: Click the BCC button in the Show Fields section of the ribbon.
You can then include the email addresses of people whom you would like to receive your messages, but you do not want other people to be able to see that they have been included on the message.