Dec 5, 2006

Required Active Directory Attributes for Email Delivery

--- copied from “Exchange 2003 Transportation and Routing Guide”

When you are troubleshooting an NDR, verify that all mail-enabled attributes that Message Categorizer requires exist for that recipient in Active Directory. In Exchange 2000, multiple attributes must be correct for messages to be categorized:

homeMDB
homeMTA
legacyExchangeDN
mail
mailNickname
msExchHomeServerName
msExchMailboxGuid
msExchMailboxSecurityDescriptor
proxyAddresses

This list of required attributes is valid only if the recipient is a mailbox-enabled object in Active Directory (for example, an Exchange 2003 recipient). However, if the recipient is an Exchange Server 5.5 recipient, the only attributes that have to be present are:

legacyExchangeDN
homeMDB
homeMTA

For mail-enabled objects (for example, a custom recipient) and alternate addresses, the targetAddress attribute is required. If the targetAddress attribute is not present, the fallback is to the mail attribute.

If an e-mail message is missing any of the required attributes or if they are incorrect, the message may remain in the categorizer, and no events are created in Event Viewer. If you track the message, it appears in Message Categorizer or it generates an NDR, depending on which attribute is missing. If you want to check these attributes for a user in Active Directory, use the LDP tool or ADSI Edit. For more information about the LDP tool or ADSI Edit, see the Windows online documentation.