After upgrade to JIRA 8.15.0 comment/update/any action on issue, notifications do not send at all. Тest mails arrive successfully Mail server work and receive mail. Notification scheme checked via Notification helper. Users have to get mail on comment. I do not see any mail errors in JIRA outgoing mail log. (I turned on debug for mail)
Our instance is having the same issue. Previously on 8.2 and email batches worked fine. After upgrading to 8.15, email batches worked for 1 week before breaking. We have >100 projects all associated with notification schemes where they notify each time an issue is updated.
Nothing populates in the mail queue.
Sending test emails work fine.
There are no errors in our logs.
Disabling mail batching populates the mail queue again and successfully sends out emails.
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