It's not an error I recall having been reported before so forgive me for asking some beginner level questions, which I hope will assist Israel.
1. Have you successfully emailed the list or archive in the past?
2. Can you confirm you subscribed to the list at: http://duerer.usc.edu/mailman/listinfo.cgi/robotics-worldwide 3. Can you confirm that you are using the address found on the archive under: Options > Post by email
4. As you are mailing your post to the archive, from what address is the error message returned.
Just a Volunteer Nabble Helper - because the nice folk at Nabble have helped me! GregHelp - Building a set of answers to Nabble FAQs.