The MSExchange FrontEnd Transport service crashes when email messages that contain a null "X-OriginatorOrg" message header are processed.


This problem occurs because the Inbound Trust Agent does not invoke the SmtpDomainctor when the "X-OriginatorOrg" message header is null.


To fix this problem, installĀ Cumulative Update 12 for Exchange Server 2013 or a later cumulative update for Exchange Server 2013.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.


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