root@raspberrypi:/etc/mailserver# ./setup.sh debug fail2ban
No IPs have been banned.

root@raspberrypi:/etc/mailserver# docker exec -it mailserver fail2ban-client status postfix
Status for the jail: postfix
|- Filter
|  |- Currently failed:	0
|  |- Total failed:	0
|  `- File list:	/var/log/mail.log
`- Actions
   |- Currently banned:	1
   |- Total banned:	1
   `- Banned IP list:	167.***.***.203

root@mail:/# iptables -S INPUT
iptables v1.8.2 (legacy): can't initialize iptables table `filter': Table does not exist (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.

services:
  mailserver:
    container_name: mailserver
    image: docker.io/mailserver/docker-mailserver
    hostname: mail
    domainname: domain.com
    environment:
      - ENABLE_FAIL2BAN=1
      - ENABLE_POP3=1
      - ENABLE_SPAMASSASSIN=1
      - SPAMASSASSIN_SPAM_TO_INBOX=1
      - ENABLE_POSTGREY=1
      - ENABLE_SASLAUTHD=0
      - ONE_DIR=1
      - SSL_TYPE=manual
      - SSL_CERT_PATH=/etc/letsencrypt/live/domain.com/fullchain.pem
      - SSL_KEY_PATH=/etc/letsencrypt/live/domain.com/privkey.pem
    env_file:
      - mailserver.env
    ports:
      - "25:25"
      - "110:110"
      - "143:143"
      - "465:465"
      - "587:587"
      - "993:993"
      - "995:995"
    volumes:
      - ./config/data/maildata:/var/mail
      - ./config/data/mailstate:/var/mail-state
      - ./config/data/maillogs:/var/log/mail
      - ./config:/tmp/docker-mailserver
      - /etc/letsencrypt:/etc/letsencrypt:ro
      - /etc/localtime:/etc/localtime:ro
    cap_add:
      - NET_ADMIN
      - SYS_PTRACE
    restart: unless-stopped