<Li> To: primary recipients </Li> <Li> CC: carbon copy to secondary recipients (other interested parties) </Li> <Li> BCC: blind carbon copy to tertiary recipients who receive the message . The primary and secondary recipients cannot see the tertiary recipients . Depending on email software, the tertiary recipients may only see their own email address in BCC, or they may see the email addresses of all primary and secondary recipients . </Li> <P> It is common practice to use the BCC field when addressing a very long list of recipients, or a list of recipients that should not (necessarily) know each other, e.g. in mailing lists . </P>

What is the purpose of the bcc option in an email