Suggest creating an incident report when setting test X-headers
When tuning malware and spam filters, there is an option to add an X-header when a message meets a filter, rather than taking action. There is already a tool popup; add a link to an article about creating an advanced incident report, searching on message headers. Note in the tip that this is how one would test this filter.
Currently, it is not obvious that this is the way to audit this. Was disappointed this was not a feature in mail trace.