Heavy increase in spam influx this week?

[Vlad Mazek]

How do you manage concurrent connections in Sendmail? I know about
confCONNECTION_RATE_THROTTLE and  WINDOW_SIZE but is there anything that
will limit the number of concurrent connections from a single IP address?

-Vlad

On 8/31/07, Gareth <list-mailscanner at linguaphone.com> wrote:
>
> cat /var/log/maillog | grep -E "(connection count|concurrency)"
> Looking through my logs there have been the odd one or two IP addresses in
> the past with about 10 active connections at once but starting from the
> 27th
> I started to see connection of over 20 concurrent.
>
> I have dropped the concurrent connections per IP from 50 down to 5. We
> only
> have a 1Mbps internet connection so if any genuine person tries to send us
> more than that at the same time I would prefer to limit it to conserve
> bandwidth anyway.
>
> I think I'll do what you did and reduce the smptd_timeout aswell.
>
> > -----Original Message-----
> > From: mailscanner-bounces at lists.mailscanner.info
> > [mailto:mailscanner-bounces at lists.mailscanner.info]On Behalf Of Leland
> > J. Steinke
> > Sent: 31 August 2007 18:55
> > To: MailScanner discussion
> > Subject: Re: Heavy increase in spam influx this week?
> >
> >
> > Kai Schaetzl wrote:
> >
> > > My Postfix machines still suffer from the backlog of bots, as I
> > haven't checked yet
> > > if Postfix provides similar time-out options. Anyone knows?
> >
> > smtpd_timeout?
> >
> > I started reducing this from 300s to 120s several moments ago, after
> > catching up on my email after a particularly long meeting discussing,
> > among other things, requirements for new spam/virus filtering servers...
> >
> >
> > Leland
> > --
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> >
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-- 
-Vlad
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