version: "3.8"

# TODO(decentral1se): rename `postfix_override` to `mailman_override` because
#                     there are more override files now and it is good to be
#                     more specific

services:
  smtp:
    environment:
      - MAILMAN_POSTFIX_OVERRIDES
    networks:
      - default
    volumes:
      - "shared-mailman-core:/opt/mailman/"
    configs:
      - source: postfix_override
        target: /overrides/postfix.cf

volumes:
  # https://git.autonomic.zone/coop-cloud/mailman3/src/branch/master/compose.yml
  shared-mailman-core:
    external: true
    name: ${MAILMAN_CORE_VOLUME}

configs:
  postfix_override:
    name: ${STACK_NAME}_postfix_overrides_${POSTFIX_OVERRIDE_VERSION}
    file: postfix.cf.tmpl
    template_driver: golang