The XML file type is included in the CAS Exclusion List on upgrade from earlier releases but not on a fresh install of Messaging Gateway 10.6.3.
This issue has been resolved by the SMG 10.6.4 release.
For earlier SMG releases, systems which have been upgraded to v10.6.3 will need to have the XML file type manually added to the CAS exclusion list if XML files are not intended to be processed by Threat Defense.
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