container-server/services/mail/docker-compose.yml

version: '3.7'

# https://hub.docker.com/r/mailserver/docker-mailserver
# https://docker-mailserver.github.io/docker-mailserver/edge/examples/tutorials/basic-installation/
# https://github.com/docker-mailserver/docker-mailserver
# https://github.com/docker-mailserver/docker-mailserver/blob/master/docs/content/config/advanced/mail-sieve.md

# create account: task srv:mail-setup -- email add <user>@<domain>

networks:
  mail:
    name: mail

services:
  mail:
    image: mailserver/docker-mailserver:12
    container_name: mail
    restart: "${RESTART:-no}"
    hostname: post
    domainname: ${BASE_DOMAIN}
    environment:
      - SSL_TYPE=letsencrypt
      # You may want to enable this: https://docker-mailserver.github.io/docker-mailserver/edge/config/environment/#spoof_protection
      # See step 8 below, which demonstrates setup with enabled/disabled SPOOF_PROTECTION:
      - SPOOF_PROTECTION=0
      # Allow sending emails from other docker containers
      # Beware creating an Open Relay: https://docker-mailserver.github.io/docker-mailserver/edge/config/environment/#permit_docker
      - PERMIT_DOCKER=connected-networks
      - ONE_DIR=1
      - ENABLE_AMAVIS=0
      - ENABLE_POSTGREY=0
      - ENABLE_CLAMAV=0
      - ENABLE_SPAMASSASSIN=0
      - ENABLE_MANAGESIEVE=0
      - ENABLE_FAIL2BAN=0
      - TZ=${TIMEZONE}
      - POSTMASTER_ADDRESS=postmaster@${BASE_DOMAIN}
    ports:
      - "25:25"     # SMTP  (explicit TLS => STARTTLS)
      - "143:143"   # IMAP4 (explicit TLS => STARTTLS)
      - "465:465"   # ESMTP (implicit TLS)
      - "587:587"   # ESMTP (explicit TLS => STARTTLS)
      - "993:993"   # IMAP4 (implicit TLS)
      - "4190:4190" # managesieve
    volumes:
      # config
      - ${BASE_DIR:-/srv}/mail/config:/tmp/docker-mailserver/
      # Mail data
      - ${BASE_DIR:-/srv}/mail/mail-data:/var/mail/
      - ${BASE_DIR:-/srv}/mail/mail-state:/var/mail-state/
      - ${BASE_DIR:-/srv}/mail/mail-logs:/var/log/mail/
      # certificates
      - ${CERTS_DIR}/post.${BASE_DOMAIN}/post.${BASE_DOMAIN}.crt:/etc/letsencrypt/live/post.${BASE_DOMAIN}/fullchain.pem:ro
      - ${CERTS_DIR}/post.${BASE_DOMAIN}/post.${BASE_DOMAIN}.key:/etc/letsencrypt/live/post.${BASE_DOMAIN}/privkey.pem:ro
      # - ${CERTS_DIR}/mail.${BASE_DOMAIN}:/etc/letsencrypt/live/
    networks:
      - mail
    # cap_add:
    #   - NET_ADMIN # For Fail2Ban to work