Event Id8516
SourceMSExchangeIS
DescriptionThe delivery of a message failed because the messages content type was incorrect. A non-delivery report is being sent to the messages originator
Event InformationAccording to Microsoft:
Cause:

When creating a Mailbox object using the IS/DS consistency adjuster, for example after restoring an old backup of the Exchange Server directory, the DELIV-EXT-CONTENT-TYPES attribute is not re-created. This mailbox may not be able to receive messages from an X.400 connector.
Resolution:
To resolve this problem, obtain and install the latest service pack for Exchange Server version 5.5.
Reference LinksIS/DS Check Does Not Recreate Deliv-Ext-Cont-Types for Mailbox


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