On Fri, Sep 05, 2003 at 03:14:09PM +1000, Russell Coker wrote: > On Thu, 4 Sep 2003 22:58, Eric Sproul wrote: > > First, scale is a consideration. Once we began to grow our customer > > base, our email volume began to increase dramatically. Qmail queues > > everything to disk, so the more mail you do, the more pressure you put > > on your disk I/O. The server running Qmail was always blocking while it > > I was under the impression that Sendmail also queues everything to disk.
by default, it doesn't. > How does it's queue operate then? although it can be configured otherwise (either in the config file or in command line options when calling /usr/sbin/sendmail), sendmail will first attempt to deliver a message submitted to it, and will only fall back to queuing it if the initial delivery fails. this is a performance disaster because it makes resource limiting/rationing impossible, and is probably the primary reason why a sendmail server will fall over and crash under a heavy load that other MTAs (that implement a "queue everything first, deliver out of the queue" approach) handle without breaking a sweat. BTW, this is also one of the reasons why sendmail is slow with most list managers - most of them do not call /usr/sbin/sendmail with '-O DeliveryMode=q' craig -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
