We are running JIRA Service Desk 3.6.2 and recently developed an issue where our issue creators/watchers are no longer receiving email notifications.
JIRA Service Desk administrators receive email notifications when issues are created, however the issue creators don't receive notifications when an issue is commented, resolved etc.
I have checked the Default Notification Schemes and that is set to send notifications. I have also used the notification helper which confirms the creators/watchers should be receiving email notifications. Test emails also send without issues.
We have multiple projects in JIRA and all are affected so I don't think it is anything specific to a project.
Can anyone point me in the right direction here? It used to work until about a week ago and we can't work out what has changed.