Re: [exim] Exim 4.68 defeats spammers!

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Author: Mark Rigby-Jones
To: exim-users
Subject: Re: [exim] Exim 4.68 defeats spammers!
On 31 Aug 2007, at 15:59, Marc Perkel wrote:
> Interesting. I'm wondering if that is happening to me. The number
> of open connection to my main serve has increased by almost 10
> times normal. I have the capacity to handle it and the load levels
> haven't increased. So maybe the same thing is happening to me as
> happening to you?

It's possible. Certainly one big difference with this attack is that
CPU load wasn't hugely affected. I've got the connection limit set at
a point where normally the servers are under pretty heavy load by the
time it's reached and have probably dropped back to queue_only. This
time, as most of the connections were simply hanging until they timed
out, the load only went up slightly - meaning it did take rather
longer to set off the alarm bells.

Mark Rigby-Jones, System Operations Manager
CI-Net, Network House, Langford Locks, Kidlington, OX5 1GA
CI-Net is the trading name for Community Internet plc
A company registered in England and Wales number 3155758
t: 01865 856009 m: 07747 862201 e: mark.rigby-jones@???