version: "3.8"

services:
  postfix:
    build: .
    container_name: postfix-relay
    hostname: ${SERVER_HOSTNAME:-postfix-relay}
    restart: unless-stopped
    ports:
      - "${SMTP_LISTEN_PORT:-25}:25"
    environment:
      - TIMEZONE=${TIMEZONE:-America/New_York}
      - SMTP_SERVER=${SMTP_SERVER}
      - SMTP_PORT=${SMTP_PORT:-587}
      - SMTP_USERNAME=${SMTP_USERNAME}
      - SMTP_PASSWORD=${SMTP_PASSWORD}
      - DOMAIN=${DOMAIN}
      - SERVER_HOSTNAME=${SERVER_HOSTNAME}
      - SMTP_NETWORKS=${SMTP_NETWORKS}
      - SMTP_HEADER_TAG=${SMTP_HEADER_TAG}
      - DEBUG=${DEBUG:-no}
    volumes:
      - "${DATA_FOLDER:-.}/logs:/var/log"
      - "${DATA_FOLDER:-.}/mail:/var/mail"
      - "${DATA_FOLDER:-.}/spool:/var/spool/postfix"
    networks:
      - postfix-network
    logging:
      driver: "json-file"
      options:
        max-size: "10m"
        max-file: "3"
        labels: "service=postfix-relay"
    healthcheck:
      test: ["CMD", "postfix", "status"]
      interval: 30s
      timeout: 10s
      retries: 3
      start_period: 40s

networks:
  postfix-network:
    driver: bridge
    ipam:
      driver: default
      config:
        - subnet: 172.28.0.0/16
          gateway: 172.28.0.1