Microsoft KB Archive/161948

= XCON: MTA NDRs Messages with Headers in P2 Part of Message =

Article ID: 161948

Article Last Modified on 10/28/2006

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APPLIES TO


 * Microsoft Exchange Server 4.0 Standard Edition

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This article was previously published under Q161948



SYMPTOMS
The Microsoft Exchange Server Message Transfer Agent (MTA) may not deliver incoming mail that includes headers in the P2 part of the message that comply with RFC 1327. If this is the case, the Microsoft Exchange Server MTA generates a nondelivery report (NDR) to the sender. Incoming mail from Innosoft's PMDF has exhibited this behavior.



CAUSE
The Microsoft Exchange Server MTA does not recognize the RFC 1327 headers, and thus rejects the mail message.



WORKAROUND
To work around this problem, obtain the hotfix mentioned below. With the hotfix, the MTA now allows these headers to pass through without generating an NDR. However, the MTA neither interprets the RFC 1327 headers, nor acts on them.



STATUS
Microsoft has confirmed this to be a problem in Microsoft Exchange Server, version 4.0. This problem was corrected in the latest Microsoft Exchange 4.0 U.S. Service Pack. 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
The P2 part of a message is a header that describe the message and how the receiving MTA should deal with it. RFC 1327, "Mapping between X.400(1988) / ISO 10021 and RFC 822," equates headers of like functionality between Internet mail and X.400 mail. Internet mail headers primarily come from RFC 822, but there have been later RFCs (for example, MIME) that augment the RFC 822 headers.

Keywords: kbbug kbfix kbusage KB161948

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