Hello guys, just to:
sudo visudo
append this: user ALL=NOPASSWD:/usr/sbin/iptables 
(just change user with the user that run mis)
On Event editor add:
Active:yes
Event Type: Blocked IP
Shell command to execute: sudo iptables -A INPUT -s @IP@ -j DROP

Enjoy ;-)

--- Mystic BBS v1.12 A47 2021/12/24 (Linux/64)