On 17/03/2014 17:22, Aidas Kasparas wrote:
> Hi,
>
> what do you use to prevent brute force attacks over pop3/imap protocols?
> For ssh denyhosts works well enough, I would like to have something for
> mail services too.
>
Hi Aidas,
fail2ban is a commonly used solution for this situation.
It automatically adds iptables rules to drop traffic from IP's which
repeatedly hit the various log files.
It has plenty of configuration options.
It either supports courier's log format out-of-the-box or can be easily
configured to do so.
Regards,
Tim Lyth
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