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08.21.2008 at 05:26AM PDT, ID: 23666404
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6.8

Unable to receive email from certain senders

Asked by QGSmith in Spam Black Holes, Exchange Email Server, SBS Small Business Server

Tags: , ,

Hi

We are unable to receive email from certain senders. The one sender gets an undeliverable note. (Internet header attached), the other user gets no undeliverable note. When the user that doesn't get any undeliverable message enables the option to receive a delivery receipt, they get the receipt back saying that the message was successfully delivered however we don't receive any email from them. I have asked our ISP to check if we are not listed as SPAM senders (still waiting for their confirmation).

I have checked our TREND spam filters and also marked both senders to the approved sender list.

I have sent a test message using Telnet from another external computer when sending to our server on behalf of both their servers posing as a known user on their mail server and I did receive the Telnet tests from both senders.
We do make use of NATting on our Cisco 800 router. We have 5 static IP addresses. The router was recently swapped due to a hardware fault. There is a possibility that our mail receiving problems could have started from then on.

Please investigate the attached message header we got from the one sender.

Thanks
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Attachments:
 
header.txt (4 KB) (File Type Details) 
Message Header
 
[+][-]08.21.2008 at 06:07AM PDT, ID: 22278990

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[+][-]08.21.2008 at 06:18AM PDT, ID: 22279120

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[+][-]08.21.2008 at 06:36AM PDT, ID: 22279330

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[+][-]08.21.2008 at 08:16AM PDT, ID: 22280435

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[+][-]08.24.2008 at 03:48PM PDT, ID: 22302308

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[+][-]08.27.2008 at 12:19AM PDT, ID: 22322489

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[+][-]08.28.2008 at 11:55AM PDT, ID: 22338451

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[+][-]08.28.2008 at 11:09PM PDT, ID: 22342874

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[+][-]08.29.2008 at 12:45PM PDT, ID: 22348665

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[+][-]09.01.2008 at 12:24AM PDT, ID: 22358026

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About this solution

Zones: Spam Black Holes, Exchange Email Server, SBS Small Business Server
Tags: Microsoft, Exchange (Small business Server 2003), 2003
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Solution Provided By: QGSmith
Participating Experts: 2
Solution Grade: A
 
 
[+][-]09.02.2008 at 08:17AM PDT, ID: 22368080

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