mail rejection by Exchange? X-Loop: outOfSpace

In the last day or so users have been experiencing email rejection of incoming mail from outside the domain; the emails are bounced back to the originating server with the following note:

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Subject: MESSAGE NOT DELIVERED: Trying to send this again.

Your message could not be delivered. The User is out of space. Please try to send your message again at a later time.

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This is the full body of the email that is bouced back:

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X-Gmail-Received: fb452917ec95b9092f25b962c62a4bef3834f339
Delivered-To: precedence@gmail.com
Received: by 10.48.14.15 with SMTP id 15cs65239nfn;
        Fri, 21 Apr 2006 08:24:36 -0700 (PDT)
Received: by 10.66.238.12 with SMTP id l12mr1557514ugh;
        Fri, 21 Apr 2006 08:24:36 -0700 (PDT)
Return-Path: <tehrlich@athomehealth.org>
Received: from host2.osmnetworks.net (host2.osmnetworks.net [209.239.34.243])
        by mx.gmail.com with ESMTP id y1si1277301uge.2006.04.21.08.24.35;
        Fri, 21 Apr 2006 08:24:36 -0700 (PDT)
Received-SPF: neutral (gmail.com: 209.239.34.243 is neither permitted nor denied by best guess record for domain of tehrlich@athomehealth.org)
Received: (from athome@localhost)
      by host2.osmnetworks.net (8.13.6/8.12.10) id k3LFOYRd010774;
      Fri, 21 Apr 2006 11:24:34 -0400
Date: Fri, 21 Apr 2006 11:24:34 -0400
From: tehrlich@athomehealth.org
Message-Id: <200604211524.k3LFOYRd010774@host2.osmnetworks.net>
X-Authentication-Warning: host2.osmnetworks.net: athome set sender to tehrlich@athomehealth.org using -f
To: precedence@gmail.com
References: <ce1feb7b0604210824h7c48bd4fob68f42c82bb21299@mail.gmail.com>
In-Reply-To: <ce1feb7b0604210824h7c48bd4fob68f42c82bb21299@mail.gmail.com>
X-Loop: outOfSpace
Precedence: junk
Subject: MESSAGE NOT DELIVERED: me again

Your message could not be delivered. The User is out of space. Please try to send your message again at a later time.

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We are running Exchange Server, Checkpoint, and Symantic Mail Security for Exchange.

Though it is feasable that emails from gmail or yahoo domains (like the above) could be rejected, email from very legitimate sources is rejected as well.  

Any ideas would be greatly appreciate!

-- Trever Ehrlich
Network Technician
At Home Health
itatahhAsked:
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SembeeCommented:
That isn't an Exchange server message.
A quick look at the server answering email for your domain indicates that it is sendmail. Therefore that is the server to look at.

mail.athomehealth.org or host2.osmnetworks.net - the DNS isn't particularly clear.

Simon.

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