Event ID - 12006

Event Id12006
SourceMSExchangeIS Mailbox Store
DescriptionError <error code> occurred while processing message <message id> from <host name>. The archive filename is <file name>.
Event InformationTo determine the origin, destination, or cause of the error, review the error returned with this message file. Save the message as an .msg attachment from a MAPI client. If possible, use a POP or IMAP client to save the message as an .eml file, and then contact to Microsoft Support Services.
Reference LinksXFOR: 12006 and 4117 Errors when IMS Receives an SMTP Message

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