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Event ID: 6025 Source: MSExchangeTransport

The categorizer failed to expand the dynamic distribution list with address %1:%2 because of a misconfiguration in the directory. The dynamic membership base DN is invalid.
As per Microsoft: "If you create a query-based distribution group that is based on an incorrect LDAP query, when a user sends to the query-based distribution group, the user receives a non-delivery report with the code 5.2.4. Also, if categorizer logging is enabled, this event or Event ID 6026 will be logged". See ME822897 for more details.

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