Notifications triggered via the Jira REST API will have the "reply-to" header as the user who triggered the notification instead of Jira's mail server (firstname.lastname@example.org). This will cause email replies to go directly to the user, instead of adding a comment to the ticket.
- In a Jira Cloud instance, create a test ticket. Example: TES-1.
- Make sure that some other user has permission to see the ticket.
- Execute the following, in order to trigger a notification.
The mail header should look like this: