# dig -x 66.76.63.120 +short cdm-66-76-63-120.nacd.static.cox-internet.com. # dig cdm-66-76-63-120.nacd.static.cox-internet.com +short #
Reverse DNS of your ip exists and points zu cdm-66-76-63-120.nacd.static.cox-internet.com, unfortunately a host named cdm-66-76-63-120.nacd.static.cox-internet.com does not exist in forward dns. That is the reason why Postfix regards your host as "unknown".
If you look again at my mail about your config, you will notice that I commented the restriction "reject_unknown_client" (and of course bl.spamcop.net), because they reject too much real mail.
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