Re: [OT] Seeing increase in smtp concurrency ?

Rajkumar S wrote:
> Hi,
>
> Does any one seeing increasing smtp concurrency for the past couple of
> weeks? I run couple of (qmail/simscan/spamassassin) mail servers and
> all experience the same problem. The spam does not increase, but this
> is hogging my mail servers. Probably a new crop of spamming tools?
>
> I am attaching one qmail-mtrg graph that shows the problem.
>
> http://img403.imageshack.us/img403/2224/smtpmonthyq4.png
>
> raj

Hi,

Yup, I've seen that across all the mail servers I manage. Seems the latest crop of Zombies don't disconnect correctly.

For qmail I added the file timeoutsmtpd in /var/qmail/control with a value of 180 inside it (default is 7200) and it seems to have fixed the problem without causing any new problems.

Mind you these are external MX servers and there are no dialup users connecting to them, if there were end users connecting I'd probably raise that 180 to 300 or maybe even 600.

Regards,

Rick Received on Thu Sep 6 12:13:55 2007