--- services: app: environment: EMAIL_TRANSPORT: "smtp" EMAIL_FROM: ${EMAIL_FROM} EMAIL_SMTP_USER: ${EMAIL_SMTP_USER} EMAIL_SMTP_HOST: ${EMAIL_SMTP_HOST} EMAIL_SMTP_PORT: ${EMAIL_SMTP_PORT:-465} EMAIL_SMTP_SECURE: ${EMAIL_SMTP_SECURE:-true} EMAIL_SMTP_PASSWORD_FILE: /run/secrets/smtp_password secrets: - smtp_password secrets: smtp_password: name: ${STACK_NAME}_smtp_password_${SECRET_SMTP_PASSWORD_VERSION} external: true