E-mails in JIRA are not sent immediately when an operation is performed. Instead, they are placed in a mail queue, which JIRA empties periodically (every minute). This is very similar to the real-life scenario, where e-mails are placed in mailboxes and picked up everyday.
Normally, you do not need to manage the mail queue. JIRA automatically places e-mails into the queue and flushes them periodically. However, as an administrator, there may be times when you wish to inspect the mail queue, especially to troubleshoot JIRA notification e-mail-related problems. Sometimes, e-mails can get stuck for a number of reasons, and inspecting the mail queue will help you identify the problems and fix them.
Perform the following steps to view the content of the mail queue:
Browse to the JIRA administration console.
Select the System tab and then the Mail Queue option. This will bring up the Mail Queue page:
This page provides you with a one-page view of the current e-mails...