version: "3.8" services: app: secrets: - smtp_password environment: - MAIL_DRIVER - MAIL_FROM_ADDRESS - MAIL_FROM_NAME - MAIL_HOST - MAIL_PORT - MAIL_TLS - MAIL_USERNAME - MAIL_PASSWORD - MAIL_PASSWORD_FILE=/run/secrets/smtp_password secrets: smtp_password: name: ${STACK_NAME}_smtp_password_${SMTP_PASSWORD_VERSION} external: true