Learned something, I think.

If I get one with a forged header, this happens when I try and report it...
Please ensure that cox.net is not your own service provider.
Will not trust anything beyond this header
Forgery detected, or mailhost configuration incomplete. Please verify source IP identified.
You have failed to configure your own mail host, from which you pop mail
Mailhost: pop.west.cox.net ( 68.6.19.2 )
No source IP address found, cannot proceed.
Cox is my ISP and I am not able to continue. But if the spam has a forged header, but is also blocked because of it being an open proxy, then it allows me to submit the reports to the proper providers.
Thanks Ellen. I am waiting to report a ton of spam. My heldmail is a couple of pages long now.