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Updated:August 7, 2014
The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.
This document describes an issue when X-headers are missing / not visible on Microsoft Exchange server.
We have recently had reports, from customers running Microsoft Exchange™ of missing X-Headers. In environments where the Cisco Email Security Appliance (ESA) sends inbound email first to an Exchange 5.5 server, and the 5.5 server forwards the email to an Exchange 2003 server, there is an undocumented bug, in the Microsoft code, which strips and/or modfies the values of custom X-Headers. This bug persists even if both Exchange servers have the most current updates installed. Please follow the link below for information on resolving the issue.