dimples0621,

Place all the addressees in the Bcc: line of the message. (Click To:, select the recipients and click the Bcc:-> button.)

To follow up on Denny's information, if you don't see a Bcc: field below To: and Cc: in the Compose window, select View in the message window, and then All Headers, and the Bcc field should appear in that and future Compose Message/Reply windows.  It's normally not present in the default configuration of Outlook Express.

That's what you see on your end, because you sent it.  What the recipient sees is "Undisclosed Recipient," and that's it.  It wouldn't do to have the sender unable to verify what was sent to whom, thus your ability to see your selected recipients.

You're very welcome.  You can test this by sending a message to yourself, with your address in the Bcc: field.  What you'll probably see in the To: line of the received message is "Unknown Recipient." If you look in Properties of the Sent Message, you'll see your own address, which is as things should be.