---
# Optional SMTP relay overlay.
# Add :compose.smtp.yml to COMPOSE_FILE in your app .env to enable.
# Requires a running postfix-relay or similar SMTP service on the swarm.
#
# Example .env additions:
#   COMPOSE_FILE=compose.yml:compose.smtp.yml
#   SMTP_HOST=postfix-relay
#   SMTP_PORT=25
#   SMTP_FROM=noreply@example.com

version: "3.8"

services:
  app:
    environment:
      - BACKDROP_SMTP_HOST=${SMTP_HOST:-postfix-relay}
      - BACKDROP_SMTP_PORT=${SMTP_PORT:-25}
      - BACKDROP_SMTP_FROM=${SMTP_FROM:-}