Microsoft KB Archive/170054

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XCON: Read Receipt May Not Be Returned From ISOCOR MTA

Article ID: 170054

Article Last Modified on 10/28/2006


  • Microsoft Exchange Server 4.0 Standard Edition
  • Microsoft Exchange Server 5.0 Standard Edition
  • Microsoft Exchange Server 5.5 Standard Edition

This article was previously published under Q170054


When a Microsoft Exchange user sends a message with a read receipt request to an ISOCOR message transfer agent (MTA) user, the ISOCOR MTA may not send back a read notification report.


This behavior can occur when the Microsoft Exchange user sends the message to an ISOCOR user with the following X.400 address:


When the CN address field is used over a 1984 mode X.400 connection, it is moved to the Domain Defined Attribute (DDA) field during the downgrade process. If the message also contains a delivery receipt request, the ISOCOR MTA sends that, but does not send back a read notification report. This has been found to be a limitation in the ISOCOR ISOPLEX 800 v.1.15. This behavior is by product design.

Keywords: kbbug KB170054