While Jira automatically flushes the mail queue, you can also manually flush the queue if it gets stuck or sends out emails immediately. When you manually flush the queue, Jira will try to send all the emails that are currently in the queue.
Perform the following steps to manually flush the mail queue:
- Browse to the Mail queue page
- Click on the Flush mail queue button
If Jira is successful in sending emails, you will see the queue shrink and the items disappear. If some emails fail to be delivered, those items will be highlighted in red.