Is it possible to set up a configuration for SMTP server via docker-compose? For example we can do such thing (code below) for connection to database, but I cannot find solution for mailing server.

version: "3.3"

services:
  auth-db:
    image: postgres:11.9-alpine
    environment:
      PGDATA: /var/lib/postgresql/data/pgdata
      POSTGRES_USER: ${POSTGRES_USER}
      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
    networks:
      - auth-db
    restart: unless-stopped
    volumes:
      - db_data:/var/lib/postgresql/data

  fusionauth:
    image: fusionauth/fusionauth-app:latest
    depends_on:
      - auth-db
    environment:
      DATABASE_URL: jdbc:postgresql://auth-db:5432/fusionauth
      DATABASE_ROOT_USERNAME: ${POSTGRES_USER}
      DATABASE_ROOT_PASSWORD: ${POSTGRES_PASSWORD}
      DATABASE_USERNAME: ${DATABASE_USERNAME}
      DATABASE_PASSWORD: ${DATABASE_PASSWORD}
      FUSIONAUTH_APP_MEMORY: ${FUSIONAUTH_APP_MEMORY}
      FUSIONAUTH_APP_RUNTIME_MODE: development
      FUSIONAUTH_APP_URL: http://fusionauth:9011
      SEARCH_TYPE: database

    networks:
      - auth-db
    restart: unless-stopped
    ports:
      - "9011:9011"
    volumes:
      - fa_config:/usr/local/fusionauth/config

networks:
  auth-db:
    driver: bridge

volumes:
  db_data:
  fa_config:

What is the use case?
During integration testing I would like to have set up all infrastructure services automatically using single shell script. In such tests I would test registration of user account, but for it I need to confirm email address using Mailcatcher.