Microsoft KB Archive/239007

= XCON: User Name Mapping Issues When Implementing MTA MIXER =

Article ID: 239007

Article Last Modified on 10/28/2006

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APPLIES TO


 * Microsoft Exchange Server 5.5 Service Pack 3

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This article was previously published under Q239007



SUMMARY
The MIME Internet X.400 Enhanced Relay (MIXER) (RFC 2156) does not provide any specifications for mapping variations in user names. Consequently, it is important to understand the limitations of using the address mapping scheme.



MORE INFORMATION
When the MIXER maps an SMTP address to an X.400 address, the user name mapping is as follows:

Case 1:

SMTP address is @

Mapped X.400 address is s=

Case 2:

SMTP address is. @

Mapped X.400 address is s= ;g=

Case 3:

SMTP address is. . @

Mapped X.400 address is s= ;g= ;i=

When the MIXER maps an X.400 address to an SMTP address, the user name mapping is as follows:

Case 1:

X.400 address is s=

Mapped SMTP address is @

Case 2:

X.400 address is s= ;g=

Mapped SMTP address is. @

Case 3:

X.400 address is s= ;g= ;i=

Mapped SMTP address is. . @

In most Exchange Server topologies, the SMTP address for users is the Exchange Server default, which is @. If the MIXER mapping strategy is in use in this environment, the SMTP-to-X.400 mapping works only if all X.400 addresses are in the following form:

X.400:c= ;a= ;p= ;o= ;s=

This is possible only if the administrator does not populate First Name and Last Name fields during mailbox creation. The administrator can also populate the Last Name field with the alias, if necessary.

The reverse of this problem is also true if the administrator wants to provide X.400-to-SMTP mapping. If, as mentioned above, the administrator has populated the First Name and Last Name fields at mailbox creation, the X.400 address is in the following form:

X.400:c= ;a= ;p= ;o= ;s= ;g=

The translated SMTP address in this case renders as:

. @

This mapping does not work if the default SMTP addressing scheme of @  is being used in this environment.

Additional query words: MIXER RFC2156

Keywords: kbinfo KB239007

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