[courier-users] Incoming messages hit the limits

Hello,

I have hit the limits of my ISPs mailserver while subscribing to the
Debian BTS and the queue was runing for over 4000 messages at once.

Q 1: If a customer use my "courier-mta" as relay, how can I limit the
outgoing queue to for example 1 message in 10 seconds?

Q 2: The Debian BTS received my messages (647) over 2 hours and then
there is nothing for a long time and then it send out 1294
messages in batch at once... which can hit the incoming queue.
Is there a possibility to delay the threatment of the incoming
queue?

Thanks, Greetings and nice Day
Michelle Konzack
Systemadministrator
24V Electronic Engineer
Tamay Dogan Network
Debian GNU/Linux Consultant


--
Linux-User #280138 with the Linux Counter, http://counter.li.org/
##################### Debian GNU/Linux Consultant #####################
Michelle Konzack Apt. 917 ICQ #328449886
+49/177/9351947 50, rue de Soultz MSN LinuxMichi
+33/6/61925193 67100 Strasbourg/France IRC #Debian (irc.icq.com)

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Michelle Konzack writes:

> Hello,
>
> I have hit the limits of my ISPs mailserver while subscribing to the
> Debian BTS and the queue was runing for over 4000 messages at once.
>
> Q 1: If a customer use my "courier-mta" as relay, how can I limit the
> outgoing queue to for example 1 message in 10 seconds?

There's no such rate limiting option available. Courier will, generally,
send mail at the first available attempt. There is an upper limit, but it's
a different one. Courier will, by default, open no more than four separate
connections to the same destination domain (could be different individual
MXs, or a single MX). Any additional messages to the domain gets held until
one of the existing connections finishes delivering its message.

> Q 2: The Debian BTS received my messages (647) over 2 hours and then
> there is nothing for a long time and then it send out 1294
> messages in batch at once... which can hit the incoming queue.
> Is there a possibility to delay the threatment of the incoming
> queue?

Not sure what you mean. Courier itself will accept a maximum of 5
simultaneous connections from the same /24's worth of IPs, and/or up to 5
simultaneous connections from a single IP address. That's set in the esmtpd
configuration file. That's the only available rate limiting.


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Hello Sam,

thank you for your answer.

It seems that I must shutdonw "courier-mta" for the benefit
of "exim" which i realy do not like after along period. :-(

Thanks, Greetings and nice Day
Michelle Konzack
Systemadministrator
24V Electronic Engineer
Tamay Dogan Network
Debian GNU/Linux Consultant


--
Linux-User #280138 with the Linux Counter, http://counter.li.org/
##################### Debian GNU/Linux Consultant #####################
Michelle Konzack Apt. 917 ICQ #328449886
+49/177/9351947 50, rue de Soultz MSN LinuxMichi
+33/6/61925193 67100 Strasbourg/France IRC #Debian (irc.icq.com)

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On 19.5.2008 17:50, Michelle Konzack wrote:
> It seems that I must shutdonw "courier-mta" for the benefit
> of "exim" which i realy do not like after along period. :-(
>
You're paying for the service, right? Why not raise the issue with the
ISP, then, since obviously the service you're paying for doesn't fit
your needs?

esa


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Am 2008-05-19 19:43:41, schrieb Esa:
> On 19.5.2008 17:50, Michelle Konzack wrote:
> > It seems that I must shutdonw "courier-mta" for the benefit
> > of "exim" which i realy do not like after along period. :-(
> >
> You're paying for the service, right? Why not raise the issue with the
> ISP, then, since obviously the service you're paying for doesn't fit
> your needs?
------------------------ END OF REPLIED MESSAGE ------------------------

Not realy, I pay only for the STM-4 in Paris but
the AS-Router and the servers are my own... :-)

Thanks, Greetings and nice Day
Michelle Konzack
Systemadministrator
Tamay Dogan Network
Debian GNU/Linux Consultant


--
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##################### Debian GNU/Linux Consultant #####################
Michelle Konzack Apt. 917 ICQ #328449886
+49/177/9351947 50, rue de Soultz MSN LinuxMichi
+33/6/61925193 67100 Strasbourg/France IRC #Debian (irc.icq.com)

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Michelle Konzack wrote:
>
> It seems that I must shutdonw "courier-mta" for the benefit
> of "exim" which i realy do not like after along period. :-(

What kind of control does exim allow on in/out messages?

On a different level, you might control output messages rates by
configuring traffic control with a queue discipline other than
pfifo_fast. That would limit IP packets rather than SMTP messages.
OTOH, I don't think you know how long the queue is getting at your
ISP's, therefore you cannot control the shape of that curve anyway.

Out of curiosity, may I ask why you don't deliver mail directly?




























































































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Hello Alessandro,

Am 2008-05-20 06:37:58, schrieb Alessandro Vesely:
> What kind of control does exim allow on in/out messages?

I have seen a setup, if a client send out a message to ONE destination,
over a SMTP-Relay (= exim = ME) and there are too much messages, the
messages would be troddled and not send @once...

> On a different level, you might control output messages rates by
> configuring traffic control with a queue discipline other than
> pfifo_fast. That would limit IP packets rather than SMTP messages.
> OTOH, I don't think you know how long the queue is getting at your
> ISP's, therefore you cannot control the shape of that curve anyway.
>
> Out of curiosity, may I ask why you don't deliver mail directly?

The other thing is, that the Debian BTS has hit the limits on the Mail-
Server of my current hosting provider... there where over 4000 messages
in the (postfix) queue waiting. It was between Friday and Saturday
last week and I have load the server more then all other customers in
the last week. (He has send me a graphical statistic from it)

I do not know which server hardware he use, but my "Zenith Data Systems
Express 5800 MH4500R" (4x Xeon 550 with 2 GByte of memory and 6 SCA hdd)
would handel this traffic... while half sleeping.

However, since there is DSPAM running on his the host it may be
different. I am using clamav-ng and spamassassin and have no problems.

Since I am planning to host my own server at him, I like to configure my
inbound MTA to check only <zen.spamhaus.org> on SMTP level (hit over 60%
of all incoming spam) and reject if hit. The rest should goes into a
queue (which should prevent the overload of the server) for local
delivery over procmail where $USER have there own filtering setup...

Note: The Server I want to install will get normaly arround 20-40.000
messages per day including spam and if I get more, the there is
a problem... and I am over-spamed!

Since the Server will hols courier-imap, $MTA, postgresql 8.3,
apache2 the Server should be responsive in any situations,
mean, a Spam-DoS should not hit my server and Business.

(Normaly I should install 3-4 separated servers but this would
hit my purse a little bit to much...)

Oh yes, I have already put following stuff into my

----[ '~/.procmailrc' ]-----------------

LOCKFILE=${HOME}/.procmailrc.lock

:0
* > 250000
.ATTENTION.big_messages/

:0fw
* < 250000
| /usr/bin/spamc

----------------------------------------

where the LOCKFILE would serialize the proceeding of the incoming
messages, speek, if the ~/.procmailrc is running, no second message is
accepted and the MTA try the re-deliver it later. Also this mean, that
only one spamassassin process is running per $USER (where I have 43).

Thanks, Greetings and nice Day
Michelle Konzack
Systemadministrator
24V Electronic Engineer
Tamay Dogan Network
Debian GNU/Linux Consultant


--
Linux-User #280138 with the Linux Counter, http://counter.li.org/
##################### Debian GNU/Linux Consultant #####################
Michelle Konzack Apt. 917 ICQ #328449886
+49/177/9351947 50, rue de Soultz MSN LinuxMichi
+33/6/61925193 67100 Strasbourg/France IRC #Debian (irc.icq.com)

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