Microsoft KB Archive/295734

= XCON: Non-Delivery Report Is Generated When SMTP Messages Are Relayed to a Lotus Domino Server =

Article ID: 295734

Article Last Modified on 2/28/2007

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APPLIES TO


 * Microsoft Internet Information Server 4.0
 * Microsoft Internet Information Services 5.0
 * Microsoft Exchange 2000 Server Standard Edition
 * Microsoft Exchange 2000 Enterprise Server

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This article was previously published under Q295734



SYMPTOMS
When the Internet Information Server (IIS) Simple Mail Transfer Protocol (SMTP) service is configured to relay SMTP messages to a Lotus Domino R5.x server, the message originator may receive a non-delivery report (NDR) that is similar to the following message:

This is an automatically generated Delivery Status Notification.

Delivery to the following recipients failed.

@ .com



CAUSE
This issue can occur if the Domino server has not been configured to support 8-bit MIME-formatted messages. When the SMTP service receives an 8-bit MIME-formatted message that needs to be routed to a Domino server, the SMTP service initiates an SMTP connection to the Domino server. After the SMTP service sends an EHLO command, Domino responds with its list of supported ESMTP verbs. If &quot;8BITMIME&quot; is not included in the list of support verbs, the SMTP service cannot deliver the message to the Domino recipient because Domino has not been configured to understand the message format. The SMTP service then sends the RSET command to Domino to reset the SMTP connection. Finally, the SMTP service sends an NDR to the original sender. To view the SMTP commands that are sent, use a network packet analyzer, such as Microsoft Network Monitor.



RESOLUTION
Top resolve this issue:
 * 1) On the Domino server, open the server's Configuration Document.
 * 2) Click the Router/SMTP tab, and then click the Advanced tab.

The ESMTP verbs that can be enabled are displayed in the Commands and Extensions section; one of the verbs is &quot;8BITMIME&quot;.



MORE INFORMATION
To check to see if the Domino server supports a certain extension, telnet to port 25 of the Domino server, and then type EHLO domain.com. You can perform the same telnet procedure against the SMTP service to see a larger set of supported MIME types. The SMTP service cannot down-convert an 8-bit MIME message to 7-bit.

Additional query words: smtpsvc

Keywords: kbprb KB295734

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