Hi,

I'm running Graylog using docker and run all 3 containers for Graylog 
(Graylog, MongoDB, ElasticSearch) using Docker Compose. Here is my .yml file

version: '2'
services:
  mongo:
    restart: always
    image: "mongo:3"
    volumes:
      - /volumes/docker/graylog/data/mongo:/data/db
  elasticsearch:
    restart: always
    image: "elasticsearch:2"
    command: "elasticsearch -Des.cluster.name='graylog'"
    volumes:
      - /graylog/data/elasticsearch:/usr/share/elasticsearch/data
  graylog2:
    restart: always
    image: graylog2/server:latest
    volumes:
      - /volumes/docker/graylog/data/journal:/usr/share/graylog/data/journal
      - /volumes/docker/graylog/config:/usr/share/graylog/data/config
    environment:
      GRAYLOG_PASSWORD_SECRET: **Password**
      GRAYLOG_ROOT_PASSWORD_SHA2: **Hash**
      GRAYLOG_WEB_ENDPOINT_URI: http://192.168.1.10:9000/api
      GRAYLOG_TRANSPORT_EMAIL_ENABLED: "true"
      GRAYLOG_TRANSPORT_EMAIL_HOSTNAME: mymailserver.mydomain.com
      GRAYLOG_TRANSPORT_EMAIL_PORT: 25
      GRAYLOG_TRANSPORT_EMAIL_USE_AUTH: "false"
      GRAYLOG_TRANSPORT_EMAIL_USE_TLS: "false"
      GRAYLOG_TRANSPORT_EMAIL_USE_SSL: "false"
      GRAYLOG_TRANSPORT_EMAIL_FROM_EMAIL: [email protected]
    links:
      - mongo:mongo
      - elasticsearch:elasticsearch
    ports:
      - "9000:9000"
      - "12201/udp:12201/udp"
      - "1514/udp:1514/udp"

The containers come up perfectly but not all the environment variables are 
set. I get emails from streams fine but they come from 
'[email protected]' and not my domain

I've tried adjust the config from the persistent mount /volumes/docker/
graylog/config/graylog.conf

but they don't make an impact. It seems unusual that it would take in some 
of the variables (such as the mail server) but not the FROM_EMAIL variable. 
I've also tried this with graylog2/server:2-1-1

Anyone seen this before?

Docker version 1.12.3, build 6b644ec

Distributor ID: Ubuntu
Description: Ubuntu 16.04.1 LTS
Release: 16.04
Codename: xenial

Kernel
4.4.0-57-generic

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