0. Why would BCC: be used in an e-mail?
BCC: allows the recipient to identify all the other recipients in the list when a group email address is used.
BCC: allows the sender to indicate who the email is for if there is more than one recipient.
BCC: allows the sender of a message to conceal the recipient entered in the BCC: field from the other recipients.
BCC: allows recipients to be visible to all other recipients of the message.