Well, it looks like cox simply does not want to accept email from olug.org - everyone with and @cox.net address was automatically removed from the list due to: Nov 22 11:42:32 users qmail: 1069522952.286191 delivery 163702: deferral: Connected_to_68.6.19.3_but_greeting_failed./Remote_host_said:_421_fed1mtai02.cox.net_connection_refused_from_[216.40.17.98]/