--- - 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:v3.5.1-alpine restart_policy: always networks: - name: postfix env: ALLOWED_SENDER_DOMAINS: "{{ postfix.allowed_sender_domains|join(' ') }}" HOSTNAME: "smtp.data.coop" # the name the smtp server will identify itself as