Event ID - 8516

Event Id8516
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:

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.
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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