HOWTO fail2ban with qpopper

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Configuration for qpopper pop3 daemon is done as follows:

  • First make an entry into your jail.conf (/etc/fail2ban/jail.local on Debian/Ubuntu) file.
# this is for openSUSE 10.2
[qpopper]
enabled  = true
port     = pop3
filter   = qpopperlogin
action   = iptables[name=%(__name__)s, port=%(port)s]
           sendmail-whois[name=qpopper, dest=you@mail.com]
logpath  = /var/log/mail
maxretry = 5
# this is for Debian/Ubuntu
[qpopper]
enabled  = true
port     = pop3,pop3s
filter   = qpopperlogin
logpath  = /var/log/mail.log
  • Then create a file in filter.d directory called qpopperlogin.conf The first failregex statement was sent to the fail2ban mail list by Sven Neukirchner.
# openSUSE
[Definition]
failregex = popper\[[0-9]+\]:\s\[AUTH\]\sFailed\sattempted\slogin\sto\s\S+\sfrom\shost\s(\S+)\s<HOST>(?:\s\[pop_pass\.c.*\])?$
ignoreregex =
# Debian/Ubuntu
[Definition]
failregex = popper\[[0-9]+\]:.*\(<HOST>\):\ -ERR\ \[AUTH\]\
ignoreregex =