Automatic SMARTTLS-enabled mail catching

docker-compose.yml

services:
  mailpit:
    image: axllent/mailpit:latest
    ports:
      - "25:1025"
      - "465:1025"
      - "587:1025"
    expose:
      - 8025
    volumes:
      - mailpit-data:/data
      - caddy-data:/caddy:ro
    environment:
      MP_DATABASE: /data/mailpit.db
      MP_MAX_MESSAGES: 500
      MP_MAX_AGE: 48h
      MP_SMTP_TLS_CERT: /caddy/caddy/certificates/acme-v02.api.letsencrypt.org-directory/$MP_HOSTNAME/$MP_HOSTNAME.crt
      MP_SMTP_TLS_KEY: /caddy/caddy/certificates/acme-v02.api.letsencrypt.org-directory/$MP_HOSTNAME/$MP_HOSTNAME.key
      MP_SMTP_REQUIRE_STARTTLS: true
      MP_SMTP_AUTH: "smtpuser:smtppassword"
      MP_UI_AUTH: "admin:password"
    labels:
      caddy: $MP_HOSTNAME
      caddy.reverse_proxy: "{{upstreams 8025}}"

  caddy:
    image: lucaslorentz/caddy-docker-proxy:latest
    ports:
      - "80:80"
      - "443:443"
    restart: unless-stopped
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
      - caddy-data:/data

volumes:
  caddy-data:
  mailpit-data: