How to See Bcc Recipients of Your Emails in Mac OS X Mail

When you send somebody a Bcc of a message in Mac OS X Mail, that recipient's name and address will not appear in the email, so other recipients do not see who else got the message. This is, after all, the point of Bcc.

At some later point, however, you might want to remember all the people to whom you sent that email. When you look in your Sent folder in Mac OS X Mail, however, all you see are the To and Cc recipients. Don't worry: The Bcc field isn't lost forever. Fortunately, Mac OS X Mail keeps the information at the ready for whenever you need it.

To find out to whom you sent a Bc: of a message from Mac OS X Mail:

1. Open the desired message.
2. Select View > Message.
3. Choose Long Headers from the menu.

In the now long list of headers, you should be able to find the Bcc field and its contents.

If you peek at Bcc headers regularly, you can even add them to the standard assortment of header lines displayed by default. 

To always see Bcc recipients in Mac OS X Mail:

1. Select Mail > Preferences from the menu in Mail.
2. Go to the Viewing category.
3. From the Show header detail drop-down menu, select Custom.
4. Click the + button.
5. Type Bcc.
6. Click OK.
7. Close the Viewing window.

Note: Mac OS X Mail will not display the header if no recipients are present.