Russ Allbery([EMAIL PROTECTED])@2001.04.29 14:49:03 +:
q question [EMAIL PROTECTED] writes:
[...]
Qmail is extremely network unfriendly and generates denial of service
attacks on other mailservers in its enthusiasm to deliver as many
messages as possible in a short period of time.
I appreciate your pointing this out.
From: [EMAIL PROTECTED] (John R. Levine)
To: [EMAIL PROTECTED]
CC: [EMAIL PROTECTED]
Subject: Re: Is qmail best reserved for mailing list server purposes
only?
Date: 30 Apr 2001 19:15:38 -0400
One last note on this thread. While rereading the FAQ, I came
One last note on this thread. While rereading the FAQ, I came across this
which indicates qmail has brakes to keep from generating denial of service
attacks.
http://cr.yp.to/qmail/faq/efficiency.html
Does qmail back off from dead hosts?
Answer: Yes. qmail has three backoff features: ...
--- John R. Levine [EMAIL PROTECTED] wrote:
Qmail backs off very well, but doesn't work all that well with
sendmail under heavy load. The problem is that sendmail keeps
accepting connections even when it doesn't have enough system
resources to accept mail, and tends to thrash to death.
Russ Allbery wrote:
Rather, it tries to bounce them and the bounce bounces as undeliverable.
The solution is for ORBS to stop probing systems from which no spam has
ever been sent and for which there is no reason to suspect a lack of
security.
they were a lot easier to igore when they
Oleg Polyakov wrote:
I'm not sure how qmail works if you are sending 100 messages
from server to another one.
Does it open 100 connections concurrently?
it opens maxconcurrency connections. It doesn't have per-site
concurrency limit, unles you patch it. It is reccommended, if
you are
as possible
in a short period of time. For this reason it is best reserved for mailing
list server purposes only.
Do you all agree with this opinion that qmail is best reserved for mailing
list server purposes only?
_
Get your FREE download
list server purposes
only.
Do you all agree with this opinion that qmail is best reserved for
mailing list server purposes only?
No.
--
Russ Allbery ([EMAIL PROTECTED]) http://www.eyrie.org/~eagle/
From: q question [EMAIL PROTECTED]
Qmail is
extremely network unfriendly and generates denial of service attacks on
other mailservers in its enthusiasm to deliver as many messages as
possible
in a short period of time. For this reason it is best reserved for mailing
list server purposes
qmail's author and
have him re-write it to work around the bugs in the various mail clients
while he's fixing that bug for ORBS test messages.
Do you all agree with this opinion that qmail is best reserved for
mailing
list server purposes only?
I don't. I really don't see the distinction between
Hi Russ, John, and Jason,
I appreciate your taking the time to respond to my question about the ORBS
opinion. I felt I should check it out before installing qmail and
unexpectedly becoming an infamous generator of denial of service attacks!
Russ, I appreciated hearing some of the background
One last note on this thread. While rereading the FAQ, I came across this
which indicates qmail has brakes to keep from generating denial of service
attacks.
http://cr.yp.to/qmail/faq/efficiency.html
Does qmail back off from dead hosts?
Answer: Yes. qmail has three backoff features:
Each
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