For the record - they've been ignoring my requests to have this error looked into and addressed for over a year now. Very very poor customer service and technical support over there.
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Received: (qmail 26238 invoked for bounce); 13 Jun 2010 23:45:18 -0000
Date: 13 Jun 2010 23:45:18 -0000
From: MAILER-DAEMON@apache.org
To: announce-return-133-@httpd.apache.org
Subject: failure notice
Hi. This is the qmail-send program at apache.org.
I'm afraid I wasn't able to deliver your message to the following addresses.
This is a permanent error; I've given up. Sorry it didn't work out.
<tgh@tgharold.com>:
69.36.9.168 does not like recipient.
Remote host said: 556 Address unavailable.
Giving up on 69.36.9.168.