Your list server is schizophrenic -- some headers say railcenter, some say roughstock, and they vary between messages. Ask your service provider to add "X-Mailing-List: [EMAIL PROTECTED]" (or the other name, choose one!) to the headers in the email messages. This will mark the messages with a consistant list name. Once this is accomplished, tell me, and I will merge the archives.
Jeff PS. See the FAQ at http://www.mail-archive.com/faq.html for a slight bit of further discussion.