services: website: build: context: website env_file: - .env environment: LOCAL_SMTP_HOST: smtp LOCAL_SMTP_PORT: 2500 LOCAL_SMTP_PASSWORD: smtp ports: - "8000:4321" smtp: build: context: smtp args: LOCAL_SMTP_PORT: 2500 env_file: - .env environment: LOCAL_SMTP_PORT: 2500 LOCAL_SMTP_PASSWORD: smtp REMOTE_SMTP_PASSWORD_FILE: /run/secrets/remote_smtp_password secrets: - remote_smtp_password secrets: remote_smtp_password: external: true