--- version: "3.8" services: app: secrets: - smtp_password environment: - SMTP_HOST=${SMTP_HOST} - SMTP_PORT=${SMTP_PORT:-25} - SMTP_AUTH=${SMTP_AUTH} - SMTP_TLS=${SMTP_TLS} - MAIL_FROM=${MAIL_FROM} secrets: smtp_password: name: ${STACK_NAME}_smtp_password_${SECRET_SMTP_PASSWORD_VERSION} external: true