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Email send to this domain is undeliverable - exchange 2007

MezzutOzil
MezzutOzil asked
on
My company is using email domaing - abc.com; whenever we tried to send mails to xxx.com, we get the error message:

  Delivery has failed to these recipients or distribution lists:

usera@xxx.com
Your message wasn't delivered because of security policies. Microsoft Exchange will not try to redeliver this message for you. Please provide the following diagnostic text to your system administrator.

The following organization rejected your message: mb-exc2007.abc.com

  _____  

Sent by Microsoft Exchange Server 2007







Diagnostic information for administrators:

Generating server: ca-exc2007.abc.com

usera@xxx.com
mb-exc2007.abc.com #550 5.7.1 Unable to relay ##

Original message headers:

Received: from mb-exc2007.abc.com (192.168.9.97) by ca-exc2007.abc.com
 (192.168.9.96) with Microsoft SMTP Server (TLS) id 8.1.240.5; Mon, 5 Dec 2011
 16:36:11 +0800
Received: from ca-exc2007.abc.com ([192.168.9.96]) by mb-exc2007.abc.com
 ([192.168.9.97]) with mapi; Mon, 5 Dec 2011 16:36:11 +0800
From: "ME (me@abc.com)"
To: "usera@xxx.com'" <usera@xxx.com>
Date: Mon, 5 Dec 2011 16:36:07 +0800
Subject: testing 3...
Thread-Topic: testing 3...
Thread-Index: AcyzKOgc/y73c11JR8SgVoui75i0OA==
Message-ID: <EC605E85C3316E48915B49D3C2AF8206036275F8@ca-exc2007.mjm.com.sg>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
acceptlanguage: en-US
Content-Type: multipart/alternative;
      boundary="_000_EC605E85C3316E48915B49D3C2AF8206036275F8caexc2007mjmcom_"
MIME-Version: 1.0
Return-Path: me@abc.com

Originally, there are 2 exchange 2007 servers - ca-exc2007 and mb-exc2007. Few weeks ago, MB-exc2007 was down, so all exchange roles have been transferred to CA-exc2007.

thanks,

Comment
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Neil RussellTechnical Development Lead

Commented:
Is xxx.com an external domain?
Is it only ONE domain that it happens to?
It sounds like an issue with you MX records. Confirm that your reverse DNS records tie up to your sending SMTP server.

Author

Commented:
Precisely