--- - name: setup network for postfix docker_network: name: postfix ipam_config: subnet: '172.16.0.0/16' gateway: 172.16.0.1 - name: setup postfix docker container for outgoing mail docker_container: name: postfix image: boky/postfix restart_policy: unless-stopped networks: - name: postfix env: ALLOWED_SENDER_DOMAINS: "{{ base_domain }}"