When you send an email to multiple recipients, you would probably prefer to hide the list of addresses from each recipient. You achieve this by using the blind carbon copy (BCC) function. Windows Mail, by default, has BCC hidden. Here's how to make the BCC option always visible:

- In Windows Mail, click Create Mail

- In the New Message window, click View -> All Headers. The BCC field will now appear and remain visible every time you create a new mail message. [See pic below]