If you add a recipient's name to the Bcc (blind carbon copy) box in an email message, a copy of the message is sent to that recipient, but that name is not visible to other recipients of the message.
Turn on Bcc
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Create a new email message.
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At the right end of the To line, select Bcc.
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In the Bcc box, add recipients, compose the message, and when you're ready, select Send.
View Bcc recipients
If you're the recipient of a message, you can't see whether the sender added Bcc recipients. Only the sender of a message can see the names of Bcc recipients by opening a message in the Sent Items folder where all sent messages are stored by default:
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In the Sent Items folder, open the message that you sent.
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In the Reading Pane, view the header section of the message.
Tips:
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If there are more recipients, you'll see the number of recipients and more. In the screenshot, for example, 11 more signals there are 11 more recipients listed in the Bcc box.
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Click more to expand (open) your the message header section.
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