sending e-mail with 'Bcc:' and 'Cc:' not working....

I'm a little puzzled on why does either of these two, 'Bcc' and 'Cc' not work when I had successfully send the e-mail. My best guess is that I need additional header, if so then what are the required header needed to make this 'Bcc' and 'Cc' work? Here's the Internet Header from the " To: " e-mail that worked. --clip-- Received: from localhost (host.domain.com [0.0.0.0]) by hostname.domain with SMTP (Microsoft Exchange Internet Mail Service Version 5.5.2653.13) id 1KAAMHG6; Thu, 13 Feb 2003 11:58:34 -0500 From: xxxxxx@juno.com To: xyz@xyz.com Return-Path: xxxxxx@juno.com Cc: abc@yahoo.com Subject: e-Mail Test.... Date: Thu, 13 Feb 2003 12:03:48 EST --clip-- Thanks....