Microsoft KB Archive/140938

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The information in this article applies to:


 * Microsoft Exchange Server, version 4.0

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SYMPTOMS
When Microsoft Exchange Server sends a P1 PDU to a remote Message Transfer Agent (MTA), the remote MTA may report an error.

MORE INFORMATION
The element which causes the problem is the per-recipient-indicators inside the PerRecipientMessageTransferField. Microsoft Exchange Server encodes it as an implicit BITSTRING with 3 unused bits in the last octet. The Recommendation X.411 Figure 4/X.411 defines that the 3 bits in the last octet are reserved and shall have the value zero. Microsoft Exchange Server marks them as unused and this violates the size constraints.

STATUS
Microsoft has confirmed this to be a problem in Microsoft Exchange Server version 4.0. This problem was corrected in Microsoft Exchange Server 4.0 U.S. Service Pack 2. 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" Keywords         : kbusage kbbug4.00 kbfix4.00.sp2 XADM Version          : 4.0 Platform         : WINDOWS Issue type       : Last Reviewed: March 11, 1999