Personal order of preference
qmail (it is the most beautiful piece of C programming I have ever seen)
Also qmail code is just around 16000 lines, many times
smaller than postfix.
yup - but I tend to agree with a lot of what Matthias Andree has to say - http://www-dt.e-technik.uni-dortmund.de/~ma/qmail-bugs.html
(I can't comment on exim, never used it). If you are bothered about security, sendmail is not an option.
Sendmail is actually up for a rather complete rewrite, and is shedding a lot of its old code baggage. You will find that sendmail is actually a lot more secure than what the qmail.org site claims it to be (that "comparison" would be based on really ancient sendmail versions like 8.8 i guess)
process enormous amount of local mail delivery, qmail with the big-todo patch and a patch for 'silly qmail syndrome' does better than postfix (I
Too many patches.
had to pull out postfix out of production on a server which did 600000 emails/day. The load on my box used to shoot > 100 with postfix running. With qmail however the load remained below 20.
Interesting. We run a rather large freemail / messaging hosting service with rather more mail volumes, but I have a few questions.
On a server doing largely remote deliveries I have not found much difference between qmail and postfix.
* Was this outbound delivery, or inbound (MX) for your domain - most likely inbound, from your statement
* What server hardware / OS / filesystem
* Were you running a local dns cache, or was the resolver running on another box on the same switch?
We use postfix on freebsd 4.x extensively on our MXs (in some cases that'd be a few hours load for us, tops), and we use qmail on our outbound servers (smarthosting them through a postfix box after outbound spam filtering).
11:58AM up 4 days, 6:56, 1 user, load averages: 36.16, 42.58, 56.31
last pid: 85620; load averages: 17.24, 35.01, 52.19 up 4+06:57:26 11:59:48 999 processes: 8 running, 991 sleeping
CPU states: 14.6% user, 0.0% nice, 54.2% system, 3.1% interrupt, 28.1% idle
Mem: 476M Active, 154M Inact, 205M Wired, 47M Cache, 112M Buf, 123M Free
Swap: 2048M Total, 52M Used, 1996M Free, 2% Inuse
srs
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