6 messages in net.sourceforge.lists.courier-usersRe: [courier-users] SMTP connections ...
FromSent OnAttachments
Josh M. HurdJun 23, 2005 4:05 pm 
Randall ShawJun 23, 2005 4:17 pm 
Gordon MessmerJun 24, 2005 1:05 am 
Gordon MessmerJun 24, 2005 1:14 am 
Randall ShawJun 24, 2005 8:55 am 
Jerry AmundsonJun 24, 2005 9:02 am 
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Subject:Re: [courier-users] SMTP connections very slow/timing outActions...
From:Gordon Messmer (yiny@eburg.com)
Date:Jun 24, 2005 1:14:43 am
List:net.sourceforge.lists.courier-users

Josh M. Hurd wrote:

I have taken over management of a server running courier mail services.

How long has it been in service? What version are you running right now?

I found that MAXDAEMONS was set at 40 and that limit was being reached in 1-2 seconds after courieresmtpd was restarted.

Did you see connections being dropped and logged in maillog, or did something else lead you to that conclusion?

We do receive a lot of spam, I counted about 12000 connection attempts in about 8 hours to the esmtp server.

That's still less than one connection per second, so it seems unlikely that you'd run over the MAXDAEMONS setting.

I increased the MAXDAEMONS to 128, which helped a bit. Then later to 256 which seems to have helped a bit more. I am still reaching the max connection limit and maintaining it within 20 or so all day.

I am not seeing a large number of errors in the log besides user unknown (spam)

Any recent version of Courier will record in the logs any connection that it drops due to MAXPERC, MAXPERIP, or MAXDAEMONS.

Is setting MAXDAEMONS this high normal? It seems a little extreme to me.

It's definitely abnormal for you to have to increase capasity more than 5x in one day.

Am I just putting a band-aid on a bigger issue? Does anyone have any ideas of where I should look?

Start by telling us where you have looked. :)