DOCUMENT:Q176126 14-MAR-1999 [exchange] TITLE :XCON: No NDR When You Send Message to Invalid OR Address PRODUCT :Microsoft Exchange PROD/VER:WINDOWS:5.0 OPER/SYS: KEYWORDS: ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Exchange Server, version 5.0 ------------------------------------------------------------------------------- SYMPTOMS ======== When the recipient of a message is an invalid originator/recipient (O/R) address, a non-delivery report (NDR) is generated as expected, but the NDR is never delivered to the originator of the message. CAUSE ===== When a message is sent to a manually entered X.400 O/R address (referred to as an one-off routing address) that is invalid, the store uses Address.dll to normalize the O/R address. The normalizing process consists of ordering the attributes in the O/R address, which is in the form of a string. This ordering is important so that the address can be resolved to a DN (just as for an X.400 proxy). The message is submitted to the message transfer agent (MTA). During message submission to the MTA, the store checks the syntax but not the "routability" of the message. As expected, this message causes the remote MTA to generate an NDR. As this NDR reaches the sender's store, the same code path is taken for entry ID generation for the actual recipient name. The store now proceeds to parse the NDR and encounters the attributes that refer to the actual recipient of the original message. It fails to parse these and proceeds to drop the NDR. STATUS ====== Microsoft has confirmed this to be a problem in Microsoft Exchange Server version 5.0. This problem has been corrected in the latest U.S. Service Pack for Microsoft Exchange Server version 5.0. For information on obtaining the Service Pack, query on the following word in the Microsoft Knowledge Base (without the spaces): S E R V P A C K MORE INFORMATION ================ With the fix in place, the parsing code skips the check on length and syntax of the O/R address in the NDR. Additional query words: OR ====================================================================== Keywords : Technology : kbExchangeSearch kbExchange500 kbZNotKeyword2 Version : WINDOWS:5.0 Issue type : kbbug Solution Type : kbfix ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 1999.