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

# Fail2Ban configuration file
#
# Common settings for sendmail actions
#
# Users can override the defaults in sendmail-common.local

[INCLUDES]

after = sendmail-common.local

[Definition]

# Option:  actionstart
# Notes.:  command executed on demand at the first ban (or at the start of Fail2Ban if actionstart_on_demand is set to false).
# Values:  CMD
#
actionstart = printf %%b "Subject: [Fail2Ban] <name>: started on <fq-hostname>
              Date: `LC_ALL=C date +"%%a, %%d %%h %%Y %%T %%z"`
              From: <sendername> <<sender>>
              To: <dest>\n
              Hi,\n
              The jail <name> has been started successfully.\n
              Regards,\n
              Fail2Ban" | <mailcmd>

# Option:  actionstop
# Notes.:  command executed at the stop of jail (or at the end of Fail2Ban)
# Values:  CMD
#
actionstop = printf %%b "Subject: [Fail2Ban] <name>: stopped on <fq-hostname>
             Date: `LC_ALL=C date +"%%a, %%d %%h %%Y %%T %%z"`
             From: <sendername> <<sender>>
             To: <dest>\n
             Hi,\n
             The jail <name> has been stopped.\n
             Regards,\n
             Fail2Ban" | <mailcmd>

# Option:  actioncheck
# Notes.:  command executed once before each actionban command
# Values:  CMD
#
actioncheck =

# 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 =

# Option:  actionunban
# Notes.:  command executed when unbanning an IP. Take care that the
#          command is executed with Fail2Ban user rights.
# Tags:    See jail.conf(5) man page
# Values:  CMD
#
actionunban =

[Init]

# Your system mail command
#
mailcmd = /usr/sbin/sendmail -f "<sender>" "<dest>"

# Recipient mail address
#
dest = root

# Sender mail address
#
sender = fail2ban

# Sender display name
#
sendername = Fail2Ban