Client cannot send us emails (Full Version)

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coopfab -> Client cannot send us emails (3.Feb.2010 2:21:11 PM)

We're running a sbs2003 sp2 single server network with a Firebox Edge router receiving emails via SMTP. There is one, and only one, client that cannot send us emails although he gets ours without any issue. I have checked the logs of the router and SMTP server and his emails never reach us. I have listed below the diagnostic information generated by our client's server and the only curious thing is in the reference section, his emails are somehow finding our local network, @server2.mydomain.local!

Diagnostic information for administrators:

Generating server: BWNJ-DCm.BODXXINT.COM
#550 4.4.7 QUEUE.Expired; message expired ##

Original message headers:

Received: from BWNJ-DCm.BODXXINT.COM ([fc80::2.8ra:d07f':JJS7:7f2f]) by
BWNJ-DCm.BODXXINT.COM ([fe8fJ::2flca:dU7f: nS7: lt2fo/h14l) with mapi
Mon, 1 Feb 2010 10:37:43 -0.500
From: sender <>
To: recipient <>
Date: Mon, 1. Feb 2010 10:3/:47--0500
Subject: RE: Please reply, I think we're In shape
Thread, Topic: Please reply, I think we're in shape
Message-ID: <13E91CF11866B74J.B48AE36:3:)CAOCJ~n7SRlA2114@ BWNJ-DCm.BODXXINT.COM >
References: <070C6D lA7179F740BG7FEAOI\'/bF70SA108CJl.8S@server2.mydomain.local>
<UE91CF11865B74104BAE3685CI\09917S137A2109[ii.)[3WN]- BWNJ-DCm.BODXXINT.COM >
<D70C6D1A7179F/40B67fEAOA76F70f3A30fKAB6(r:i)~iE':rv 'r-'~@server2.mydomain.local >
<13E91CF11866B741B4BAl:3685CA0991751J7A210n(BWNJ-DCm.BODXXINT.COM > <D70C6DIA7179F740B61FEAOA76Fl0BA308CABH«I) @server2.mydomain.local >
In-Reply-To: <D70C6DlAl179F740B61FEAOt\16F7Ul:1A.:108CA811@server2.mydomain.local:>
Accept-Language: en-US
Content-language: en-US

Lastly I've been able to succesfully telnet to this client.

Hope someone has some suggestions, this is weird. Thanks.

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