We are experiencing an issue where recently any replies to a service desk comment notification from an email address that is not associated with a customer are creating new issues rather than a comment on the issue that appears in the subject line. When we first set up the system any replies from non customer addresses were ignored but at some point, after a cloud update, we found that the permissions had been set so that anyone could add a new issue. At that point though, if replies came from non-customer addresses, they would be added as a new comment to the issue id in the subject. Recently this has changed. Does anyone have any idea whether we can edit the inbound message handler/processor to make it so these replies get added as a comment to the correct issue?