Pulled from an SpamCop newsgroup posting;

From: Mad King Soup
Subject: Outlook headers
Date: Thu, 15 Jul 2004

I notice that this isn't in the Spamcop FAQ at all, so I'll post it here for
comment/consideration.

Apologies if this is common knowledge.

If you use Outlook 2003 and get your email via POP or IMAP (but not Exchange), there is a way to get the entire email source and therefore not have to use the Outlook/Eudora hack. You simply add a value to the Windows registry.

Find HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook\Options\Mail
Add a DWORD: SaveAllMIMENotJustHeaders
Make the value 1 (or 0x00000001)
Restart Outlook and when you get the email options, the entire email source is in the "Headers" box.

I have no idea how this works with earlier versions though, and it doesn't affect Exchange email at all.

George