fail2ban/config/action.d/sendmail-whois.conf

# Fail2Ban configuration file
#
# Author: Cyril Jaquier
#
#

[INCLUDES]

before = sendmail-common.conf

[Definition]

# Option:  actionban
# Notes.:  command executed when banning an IP. Take care that the
#          command is executed with Fail2Ban user rights.
# Tags:    See jail.conf(5) man page
# Values:  CMD
#
actionban = printf %%b "Subject: [Fail2Ban] <name>: banned <ip> from `uname -n`
            Date: `LC_TIME=C date -u +"%%a, %%d %%h %%Y %%T +0000"`
            From: <sendername> <<sender>>
            To: <dest>\n
            Hi,\n
            The IP <ip> has just been banned by Fail2Ban after
            <failures> attempts against <name>.\n\n
            Here is more information about <ip>:\n
            `/usr/bin/whois <ip> || echo missing whois program`\n
            Regards,\n
            Fail2Ban" | /usr/sbin/sendmail -f <sender> <dest>

[Init]

# Default name of the chain
#
name = default