matrix-synapse/compose.smtp.yml

---
version: "3.8"

services:
  app:
    secrets:
      - db_password
      - form_secret
      - macaroon
      - registration
      - smtp_password
    environment:
      - SMTP_APP_NAME
      - SMTP_ENABLED
      - SMTP_FROM
      - SMTP_HOST
      - SMTP_PORT
      - SMTP_USER

secrets:
  smtp_password:
    external: true
    name: ${STACK_NAME}_smtp_password_${SECRET_SMTP_PASSWORD_VERSION}