fail2ban/config/filter.d/dovecot.conf

# Fail2Ban configuration file for dovcot
#
# Author: Martin Waschbuesch
#
#

[Definition]

# Option:  failregex
# Notes.:  regex to match the password failures messages in the logfile. The
#          host must be matched by a group named "host". The tag "<HOST>" can
#          be used for standard IP/hostname matching and is only an alias for
#          (?:::f{4,6}:)?(?P<host>[\w\-.^_]+)
# Values:  TEXT
#
failregex = .*(?:pop3-login|imap-login):.*(?:Authentication failure|Aborted login \(auth failed|Aborted login \(tried to use disabled|Disconnected \(auth failed).*\s+rip=(?P<host>\S*),.*
            pam.*dovecot.*(?:authentication failure).*\s+rhost=<HOST>(?:\s+user=.*)?\s*$

# Option:  ignoreregex
# Notes.:  regex to ignore. If this regex matches, the line is ignored.
# Values:  TEXT
#
ignoreregex =