The Halon SMTP software includes software from CYREN Ltd. (formerly known as Commtouch). They are a cloud-based, Internet security technology company providing threat detection and security analytics such as spam classifications, URL categorization, and malware detection. As stated in the FAQ, Halon includes two components from CYREN, namely;
Report classification mistakes
If you are a Halon customer, you can report classification mistakes directly to us. End-users however, are encouraged to contact the administrator of the system that blocked your message, because some information needed to unblock it might only be available in the logs of that system.
The reference ID is found in the text log, on the tracking page, and sometimes in the end-user interface (via the HSL function's ["refid" => true] option argument).