emailcore:
  build: ./email_core
  ports:
    - "25:25"
    - "143:143"
    - "587:587"
  volumes:
    - /opt/dockermail/settings:/mail_settings
    - /opt/dockermail/vmail:/vmail
  links:
   - opendkim
opendkim:
  build: ./opendkim
  volumes:
    - /opt/dockermail/settings:/mail_settings