The offending posts also use From: the original message sender, and use the original message's message ID, so you'll have to track them down by content.
I've attempted contacting the postmaster address below and got no response. Clearly the system admin doesn't understand that they shouldn't be acting as a relay (ie: delivering the spam notice to all the To: header recipients, instead of the envelope recipients) and isn't listening to their postmaster mailbox, despite claims to the contrary.
At 11:48 AM 3/8/2005, Daniel A. de Araujo wrote:
SpamAssassin, running on "mail.dailyhills.com", has identified this incoming email as possible spam. The original message has been attached to this email so you can view it (if it isn't spam). If you have any questions, contact [EMAIL PROTECTED] for details.