mail:
  # image: tvial/docker-mailserver
  build: .
  hostname: mail
  domainname: my-domain.com
  ports:
  - "25:25"
  - "143:143"
  - "587:587"
  - "993:993"
  environment:
    docker_mail_domain: "my-domain.com"
  volumes:
  - ./spamassassin:/tmp/spamassassin/:ro
  - ./postfix:/tmp/postfix/:ro