Fail2ban hasn’t been working for me, I still have people running brute force attacks on my Postfix server, so I though I’d rig up something myself. This consists of a bash script that identifies multiple failures and bans them, run on cron every 10 minutes. It checks for both smtp and pop/imap login failures. #!/bin/sh […]

If you are getting any brute force attacks to your dovecot imap/pop3 server, install fail2ban to block the offenders. This works on CentOs 5.7. For other distributions, see the relevant websites. Firstly, install fail2ban. You should have the rpmforge repo from my previous post. Enable it first to install fail2ban: # cd /etc/yum.repos.d/ # vi […]