Dedicated server, hosting a PHP mail script, which is emailing the results of a form entry -- the notification email, though, is bouncing with the error indicated above. The email addresses (on different servers and two different domains) function perfectly and the script works on other servers without a problem as well.
The email is returned (to the nobody@ address for the ded. server) as undeliverable by the server. (NOT the recipient server, but the _sending_ server.
Email and header are as follows (domain names are purposefully obscured to protect the innocent -- me -- from SPAM and the other nasty variants):
This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:
SMTP error from remote mail server after end of data:
host k2smtpout-v01.prod.mesa1.secureserver.net [220.127.116.11]:
554 Message refused.
------ This is a copy of the message, including all the headers. ------
Received: from nobody by host.XXXXX.com with local (Exim 4.68)
for email@example.com; Sun, 18 Nov 2007 01:07:25 -0500
Subject: Quote Request
From: "test <no-reply@AAAAAAA.com>
Content-type: text/plain; charset=iso-8859-1
Content-Type: text/plain; charset="ISO-8859-1"
Date: Sun, 18 Nov 2007 01:07:25 -0500