Microsoft KB Archive/312415

= XADM: Some Domains Send NDRs to an Exchange 2000 Server That Runs Watchguard Firebox Firewall =

PSS ID Number: 312415

Article Last Modified on 6/5/2003

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The information in this article applies to:


 * Microsoft Exchange 2000 Server

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This article was previously published under Q312415



SYMPTOMS
When you use a Watchguard Firebox firewall with Exchange 2000 Server, you may receive the following non-delivery report (NDR) from some domains:

Your mail system could not find a way to successfully communicate with the destination system. Please notify your administrator. 5.5.0

Although messages are successfully delivered to most destinations, some messages are consistently not delivered to specific domains. Some NDRs may replace parts of the message address with &quot;xxxxxx,&quot; for example, @xxxxxxxxx.xxx.

You may instead receive the following non-delivery report (NDR) from some domains: Your message did not reach some or all of the intended recipients.

Subject: Test Message Sent:    2/12/2002 8:07 AM The following recipient(s) could not be reached:

'user@externaldomain.com' on 2/12/2002 8:14 AM         There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.





CAUSE
This behavior can occur if you enable the Simple Mail Transfer Protocol (SMTP) Proxy service on the Watchguard Firebox. If you use the SMTP Proxy service to specify which message headers are included with a message, the SMTP Proxy service may remove the bdata (binarymime) packet from the message transmission and cause the NDR.



WORKAROUND
To work around this behavior, disable the Watchguard Firebox SMTP Proxy service. Watchguard also has a software update to correct this behavior. To obtain the update, contact Watchguard support.



MORE INFORMATION
The third-party products that are discussed in this article are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.

Additional query words: e2k esmtp 5.5.7 4.4.7 xcon xfor

Keywords: kb3rdparty kberrmsg kbprb kbSecurity KB312415

Technology: kbExchange2000Search kbExchange2000Serv kbExchange2000ServSearch kbExchangeSearch

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