For the archives, the problem with my firewall is that it has a problem with TCP ECN, which was enabled on the OpenSRS mail servers in question.
Many thanks to Adrian for his extremely fast and helpful response to this! Question 2 still stands: Why does changing the contact info on a .us domain result in additional contacts being created at Neustar and the old information remaining attached to the record? Is there any way to delete a Neustar contact record? Thank you... -- ...Craig
