For inbound customers including Email Gateway, Email Forwarding and Spam Filtering the headers are:


X-HalonDuo-Scores: {"rpd":"unknown", "sa":0, "sa_scores":{"FREEMAIL_FROM":0.001, "HTML_MESSAGE":0.001}}
Envelope-Sender: bob@gmail.com
X-HalonDuo-ID: 20fsdf1859-210c-11ea-9b56-5b3414d4d306
Received: from mail-yb1-f173.google.com (mail-yb1-f173.google.com [209.85.219.173]) by inbound4.eu.mailhop.org (Halon) with ESMTPS; Tue, 17 Dec 2019



Outbound email have the headers:


X-Mail-Handler: DuoCircle Outbound SMTP

X-Originating-IP: xxx.xxx.xxx.xxx

X-Report-Abuse-To: abuse@duocircle.com (see https://support.duocircle.com/support/solutions/articles/5000540958-duocircle-standard-smtp-abuse-information for abuse reporting information)

X-MHO-User: xxxxxxx