August 2003
Intermediate to advanced
816 pages
28h 15m
English
book
Managing Linux® Systems with Webmin™ System Administration and Module Development
by Jamie Cameron
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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 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.