Symptoms
The MSExchange FrontEnd Transport service crashes when email messages that contain a null "X-OriginatorOrg" message header are processed.
Cause
This problem occurs because the Inbound Trust Agent does not invoke the SmtpDomainctor when the "X-OriginatorOrg" message header is null.
Resolution
To fix this problem, install Cumulative Update 12 for Exchange Server 2013 or a later cumulative update for Exchange Server 2013.
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
References
Learn about the terminology that Microsoft uses to describe software updates.