/etc/fail2ban/action.d/sendmail-common.conf is in fail2ban 0.10.2-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 | # 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 once at the start of Fail2Ban.
# 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" | /usr/sbin/sendmail -f <sender> <dest>
# Option: actionstop
# Notes.: command executed once 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" | /usr/sbin/sendmail -f <sender> <dest>
# 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]
# Recipient mail address
#
dest = root
# Sender mail address
#
sender = fail2ban
# Sender display name
#
sendername = Fail2Ban
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