We have noticed that when our end users are attempting to send in an attachment (usually for validation of a change that has been completed) via email to a ticket, JIRA thinks they are trying to create an internal comment and blocks the e-mail if they are not a participant on the request (or an agent).
How do we force JIRA to treat net new emails into a ticket (with ticket in subject line) as public comments? This is not a reply to any notification but an email generated by an end user to comment on a request.