Poste.io (with Lets Encrypt) + Nginx reverse proxy + Nginx Lets encrypt companion

docker-compose.yml

version: '3'

services:
  nginx-proxy:
    image: jwilder/nginx-proxy
    labels:
        com.github.jrcs.letsencrypt_nginx_proxy_companion.nginx_proxy: "true"
    container_name: nginx-proxy
    restart: unless-stopped
    ports:
      - "80:80"
      - "443:443"
    volumes:
      - /data/nginx/conf.d:/etc/nginx/conf.d
      - /data/nginx/vhost.d:/etc/nginx/vhost.d
      - /data/nginx/html:/usr/share/nginx/html
      - /data/nginx/certs:/etc/nginx/certs:ro
      - /var/run/docker.sock:/tmp/docker.sock:ro

  nginx-letsencrypt:
    image: jrcs/letsencrypt-nginx-proxy-companion
    container_name: nginx-letsencrypt
    restart: unless-stopped
    volumes:
      - /data/nginx/conf.d:/etc/nginx/conf.d
      - /data/nginx/vhost.d:/etc/nginx/vhost.d
      - /data/nginx/html:/usr/share/nginx/html
      - /data/nginx/certs:/etc/nginx/certs:rw
      - /var/run/docker.sock:/var/run/docker.sock:ro
    environment:
      - NGINX_DOCKER_GEN_CONTAINER=nginx
      - NGINX_PROXY_CONTAINER=nginx

  mailserver:
    image: poste.io/mailserver:dev
    container_name: mailserver
    restart: unless-stopped
    ports:
      - "25:25"
      - "110:110"
      - "143:143"
      - "587:587"
      - "993:993"
      - "995:995"
      - "4190:4190"
    environment:
      - LETSENCRYPT_EMAIL=info@analogic.cz
      - LETSENCRYPT_HOST=mail.poste.io
      - VIRTUAL_HOST=mail.poste.io
      - HTTPS=OFF
    volumes:
      - /etc/localtime:/etc/localtime:ro
      - /data/nginx/html/.well-known:/opt/www/.well-known
      - /data/mailserver:/data