We have confirmed at least 1 user mailbox that is not receiving our email notifications. Have tested this by creating a test ticket, setting the user in question as the "Reporter" so they should get ticket notifications. We then update the tickets with comments "Test A", "Test B" and so on changing the reporter with each comment.
We had all reporter mailboxes open and monitored the incoming email. When my colleague and I were the reporter on the ticket the notifications came through to our mailboxes as you'd expect. When the user in question was the reporter the notification did not come through. We checked their junk / clutter folder, checked their spam settings, added the JIRA response email address as a safe / allowed sender but all to no avail. The only email from this platform they can receive is the initial auto response acknowledging ticket creation when one is raised.
So it seems bizarre this user can receive some but not all email coming from JIRA.
We've now exhausted all our options testing this and are understandably concerned this may be impacting other user mailboxes as well.
Does anyone have any ideas?