[Mailman-Users] Throttling output
brad at stop.mail-abuse.org
Tue Jun 13 20:14:21 CEST 2006
At 1:22 PM -0400 2006-06-13, Dave Stern wrote:
> 'Course now we're turning to linux and are considering using postfix
> instead but the theory is the same.
Out-of-the-box, I believe that postfix is a better MTA to use for
hosting mailing lists, because configuring sendmail to work well in
that kind of environment can be tedious. That said, the more
filtering you do, the more I believe that sendmail can be made to
outperform all other general-purpose MTAs on the planet.
I currently use postfix at the two main sites that I help to
administer (ntp.isc.org and python.org), and we've got quite a bit of
filtering that we've set up, but I am confident that we could do at
least as well (or better) if we were using sendmail instead.
Of course, I'm a bit biased -- I was technical reviewer for
Nick's book, and he was my co-author for a couple of invited talks I
did on the subject of building large-scale e-mail systems, and he and
I are now involved in another project.
Sendmail, postfix, and Exim are all good MTAs. For 99.9999% of
what any site is likely to do, any of these programs should be more
than adequate. You should choose one of these programs based on your
familiarity with the packages, the level of support you can get from
your co-workers and the community, any requirements you may have for
certain specific features, etc....
But when considering switching hardware platforms, OSes, or MTAs,
you should look at whether it makes sense to change all three of
those factors at the same time, or if you should instead look at each
one independently to see which one gives you the most bang for your
My guess is that Solaris 10 with ZFS on hardware of comparable
performance (especially the I/O subsystem), will run rings around
most anything else. Postfix might be easier to maintain, and perform
better out-of-the-box than sendmail, but if you're doing a lot of
filtering (which most modern medium-to-large scale sites have to do
in order to survive), then I strongly suspect that sendmail+milter is
going to be able to be configured to meet or beat the performance you
could get out of an equivalently configured postfix installation.
Brad Knowles, <brad at stop.mail-abuse.org>
"Those who would give up essential Liberty, to purchase a little
temporary Safety, deserve neither Liberty nor Safety."
-- Benjamin Franklin (1706-1790), reply of the Pennsylvania
Assembly to the Governor, November 11, 1755
LOPSA member since December 2005. See <http://www.lopsa.org/>.
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