38.10. Viewing the Mail Queue

When Qmail receives a message, it is placed into the mail queue. If it can be send to its destination immediately, then it will be removed from the queue almost at once. If some temporary error occurs when sending, however, then it will remain queued for later processing. The Qmail server process makes periodic checks of messages in the queue, retrying each one at longer and longer intervals until it eventually gives up.

Most messages that are in the queue for a long time are there because the destination mail server is down or unreachable. Another common cause is a temporary error reported by the remote MTA, such as a lack of disk space. Webmin allows you to view messages in the queue and even delete them by following these steps:

1.
On the module's main page, click on the Mail Queue icon to go to a page listing the details of queued messages. The number of emails in the queue is displayed below the icon, so that you can see how long it is at a glance.

2.
On the mail queue page, the ID, sent date, sender, and destination of all queued messages are displayed in a table. If the queue contains more than 20 messages, only the first 20 will be displayed. To page through the rest, use the left and right arrow buttons that appear above the list.

3.
To view the actual contents of an email, click on its ID in the queue listing. All headers, the text body, and any attachments will be displayed. To view an attachment, just click on its icon. To remove just this message from the queue, hit the Delete button at the bottom of the page.

4.
To remove multiple messages from the queue, first select them using the checkboxes next to their IDs and the Select all and Invert selection links on the queue list page. Then, click the Delete selected messages button to get rid of those that you have chosen.

Unlike in the Sendmail module, there is no button on the queue page to force an immediately delivery attempt for all queued messages.

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