How do I view the list of BCC'ed recipients on an email I've received?

SOMEHOW MY EX HAS A SOFTWARE PROGRAM THAT VIEWS ALL BCC CONTACTS.
I TESTED IT AND IT IS TRUE
IT RETURNS IN FULL HEADER ALL BCC ADDYS IN ANY EMAIL PROGRAM USING A POP3 PROGRAM.
THIS INCLUDES OUTLOOK, YAHOO, HOTMAIL, AOL, NETSCAPE, EDURA, ETC....

WHAT IS THE PROGRAM, SHE WONT TELL ME OR GIVE IT TO ME?

If you recieve an email, you CANNOT see who was BCC'd on it. Period. That information is *stripped* from the mail before it is sent.

If you are the *sender* of an email on which you BCC'ed people, the some email clients will simply preserve that information in your copy of the mail in your sent mail folder.

How come I can't see the bcc list on e-mails that I've SENT out? Not received from other people, I know that those lists are meant to not be seen. But what about when I want to go back a check bcc addresses of e-mails I sent out?

That's entirely dependant on the mail program you use. Some save and show the BCC line on sent mail, others do not.

Any idea how to retrieve the bcc: recipients in an outgoing mail in the Sent folder of OE?
We are using IMAP.

How do I view a list of BCC'ed recipients that I've copied into an email in Yahoo Mail? It's driving me mad as I can never remember who I've sent emails to!

Thanks.

If you have sent a message to Undisclosed Recipients. And want to see whom you have sent the mail after sending it. Search by Message 'Subject' In Google Desktop.

Thanks and a tip of the hat to Roy Rudder for providing the answer to me. I'll pass it along here:

Just go to the sent folder and right click the email and click properties.
Then click the details tab.

how do i get the list of undisclosed recipients on emails that i have received in my email box

You don't. Please read the article you just commented on.