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+qmail's modular, lightweight design and sensible queue management make
+it the fastest available message transfer agent. Here's how it stacks up
+against the competition in five different speed measurements.
+* Scheduling: I sent a message to 8192 ``trash'' recipients on my home
+machine. All the deliveries were done in a mere 78 seconds---a rate of
+over 9 million deliveries a day! Compare this to the speed advertised
+for Zmailer's scheduling: 1.1 million deliveries a day on a
+SparcStation-10/50. (My home machine is a 16MB Pentium-100 under BSD/OS,
+with the default qmail configuration. qmail's logs were piped through
+accustamp and written to disk as usual.)
+* Local mailing lists: When qmail is delivering a message to a mailbox,
+it physically writes the message to disk before it announces success---
+that way, mail doesn't get lost if the power goes out. I tried sending a
+message to 1024 local mailboxes on the same disk on my home machine; all
+the deliveries were done in 25.5 seconds. That's more than 3.4 million
+deliveries a day! Sending 1024 copies to a _single_ mailbox was just as
+fast. Compare these figures to Zmailer's advertised rate for throwing
+recipients away without even delivering the message---only 0.48 million
+per day on the SparcStation.
+* Mailing lists with remote recipients: qmail uses the same delivery
+strategy that makes LSOFT's LSMTP so fast for outgoing mailing lists---
+you choose how many parallel SMTP connections you want to run, and qmail
+runs exactly that many. Of course, performance varies depending on how
+far away your recipients are. The advantage of qmail over other packages
+is its smallness: for example, one Linux user is running 60 simultaneous
+connections, without swapping, on a machine with just 16MB of memory!
+* Separate local messages: What LSOFT doesn't tell you about LSMTP is
+how many _separate_ messages it can handle in a day. Does it get bogged
+down as the queue fills up? On my home machine, I disabled qmail's
+deliveries and then sent 5000 separate messages to one recipient. The
+messages were all safely written to the queue disk in 23 minutes, with
+no slowdown as the queue filled up. After I reenabled deliveries, all
+the messages were delivered to the recipient's mailbox in under 12
+minutes. End-to-end rate: more than 200000 individual messages a day!
+* Overall performance: What really matters is how well qmail performs
+with your mail load. Red Hat Software found one day that their mail hub,
+a 48MB Pentium running sendmail 8.7, was running out of steam at 70000
+messages a day. They shifted the load to qmail---on a _smaller_ machine,
+a 16MB 486/66---and now they're doing fine.