Stop details info reply from Exchange 2010 Server of undeliverable message to external recipent

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Joe Tam

Dear sir,
Can we stop the details info when failures reply? Becuase it may expose company network information to external for Reverse NDR attack possibility.
From: postmaster@domain1.local [mailto:postmaster@domain1.local]
Sent: Tuesday, November 09, 2010 12:30 PM
Subject: Undeliverable: testing mainly

Delivery has failed to these recipients or groups:
The e-mail address you entered couldn't be found. Please check the recipient's e-mail address and try to resend the message. If the problem continues, please contact your helpdesk.

Diagnostic information for administrators:

Generating server: domain1.local
#550 5.1.1 RESOLVER.ADR.RecipNotFound; not found ##

Original message headers:

Received: from ( by ServerS012.domain1.local
( with Microsoft SMTP Server id; Tue, 9 Nov 2010
12:30:11 +0800
Received: (qmail 31925 invoked from network); 9 Nov 2010 04:30:11 -0000
Received: from ( by with SMTP; 9 Nov 2010 04:30:09 -0000
Received: by gwj21 with SMTP id 21so3968523gwj.19 for
<>; Mon, 08 Nov 2010 20:30:07 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;; s=gamma;
DomainKey-Signature: a=rsa-sha1; c=nofws;; s=gamma;
Received: by with SMTP id a18mr3213529anh.242.1289277007030;
Mon, 08 Nov 2010 20:30:07 -0800 (PST)
Return-Path: <>
Received: from ServerN001 ([]) by with ESMTPS
id b25sm715573anb.3.2010. (version=TLSv1/SSLv3
cipher=RC4-MD5); Mon, 08 Nov 2010 20:30:05 -0800 (PST)
Reply-To: <>
From: User1 <>
To: <>
Subject: testing mainly
Date: Tue, 9 Nov 2010 12:30:01 +0800
Message-ID: <002cb1fc6$e8b023f0$5a106b10$>
MIME-Version: 1.0
Content-Type: multipart/alternative;
boundary=" ----=_NextPart_000_0029_01CB8009.D6D42740"
X-Mailer: Microsoft Outlook 14.0
Thread-Index: Act/xsNNVd3lJdXhTdCWct2GNkBBeA==
Content-Language: en-us
X-Scanned-By-domain1hk1: Scanner file id is domain1hk1-128919.19-3920-010
X-Scanned-By-domain1hk1: No known viruses found in message (received+scanned in 0.69/1.80 secs)
X-Scanned-By-domain1hk1: Spam-Check-Result: No, hits=5.21 required=7 tests=BAYES_99, HTML_90_100, MIME_HTML_MOSTLY, NB_H_DKIM, NB_SPAM_SUB_MY_EMAIL_ADDY_UN autolearn=no version=2.0
X-Spam-Status: No

Sembee [MVP]

Enable recipient validation as part of the antispam features. Then Exchange will reject the email at the point of delivery. Nothing else is sent back. The antispam agents are installed using the script in the Scripts directory, then enabled in Hub Transport in the Exchange Management Console.


Simon Butler, Exchange MVP
Blog | Exchange Resources
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