How to customize fail2ban email triggered messages on Plesk parallels 12.0.18

Edit the following conf file

/etc/fail2ban/action.d/sendmail.conf

/etc/fail2ban/action.d/sendmail-whois-lines.conf

/etc/fail2ban/action.d/mail-whois-lines.conf

/etc/fail2ban/action.d/mail.conf