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We have had a few, and growing number, of returned mails all with something similar to the following. Was wondering if anyone knew where I should start. Spamcop is clear and accoring to the logs there seems to be nothing wrong. I understand the SMTP error, but why would a server return that once in a while, then all of the sudden stop totally? My reverse DNS is returning correctly.

<xxxxxxx<_at_>> ( 554 dns;
Arrival-Date: Sat, 30 Jul 2011 20:16:38 -0500

Final-Recipient: rfc822;xxxxxxxx<_at_>
Action: failed
Status: 5.4.0
Diagnostic-Code: SMTP; 554
Received: from [] ([])
(authenticated user xxxxxx<_at_>
by (Kerio Connect 7.1.4 patch 1)
(using TLSv1/SSLv3 with cipher AES128-SHA (128 bits))
for xxxxxxx<_at_>;
Sat, 30 Jul 2011 20:16:38 -0500
From: xxxxxxx <xxxxxxxx<_at_>>
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Subject: Adjunct Faculty Orientation
Date: Sat, 30 Jul 2011 20:16:37 -0500
Message-Id: <5BC310D4-E67D-4240-9907-C3099EB201F3<_at_>>
To:xxxxxxx <xxxxxxxx<_at_>>
Mime-Version: 1.0 (Apple Message framework v1084)
X-Mailer: Apple Mail (2.1084)

[Updated on: Sun, 31 July 2011 17:44]


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Also discovered this, our rating is "poor". according to SBRS.
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