version: "3.8" services: smtp4dev: image: rnwood/smtp4dev:v3 restart: always ports: - ${APP_SMTP_4_DEV_PORT}:80 - "25:25" - "143:143" volumes: - smtp4dev-data:/smtp4dev environment: - ServerOptions__HostName=smtp4dev - ServerOptions__LockSettings=true networks: - app-network volumes: smtp4dev-data: