installed fail2ban but no matter how i try i can't get email notification

i'm using fail2ban but can't get email notification. i tried everything.

am i missing something ?

here is my /etc/fail2ban/jail.local attached

and i checked the fail2ban status

root@openmediavault:/srv# systemctl status fail2ban

● fail2ban.service - Fail2Ban Service

Loaded: loaded (/lib/systemd/system/fail2ban.service; enabled; vendor preset: enabled)

Active: active (running) since Wed 2021-04-21 10:47:21 KST; 1h 4min ago

Docs: man:fail2ban(1)

Process: 22602 ExecStartPre=/bin/mkdir -p /var/run/fail2ban (code=exited, status=0/SUCCESS)

Main PID: 22603 (fail2ban-server)

Tasks: 3 (limit: 4042)

Memory: 6.7M

CGroup: /system.slice/fail2ban.service

└─22603 /usr/bin/python3 /usr/bin/fail2ban-server -xf start

4월 21 10:47:21 openmediavault.local systemd[1]: Starting Fail2Ban Service...

4월 21 10:47:21 openmediavault.local systemd[1]: Started Fail2Ban Service.

4월 21 10:47:22 openmediavault.local fail2ban-server[22603]: Server ready

4월 21 10:47:22 openmediavault.local postfix/postdrop[22612]: warning: unable to look up public/pickup: No such file or directory

i think there is something problem last line... --->

4월 21 10:47:22 openmediavault.local postfix/postdrop[22612]: warning: unable to look up public/pickup: No such file or directory

Quote from new4u

Did you set up email correctly in the subsection "Notification" under the "System" section? I had to put in my email credentials there, as google requires password and login to send.

i installed and am using fail2ban on debian environment not on omv web plugin.