From 181948015366c2111013f7121806217a097587b5 Mon Sep 17 00:00:00 2001
From: Easton Man <me@eastonman.com>
Date: Wed, 28 Aug 2024 00:41:49 +0800
Subject: [PATCH] docs: suggest an FQDN in docker compose file (#2019)

The 'hostname' field in the docker-compose file is later used in Listmonk to generate the 'Message-Id' of each mail. The hostname is used as the id-right section of 'Message-Id'.

According to RFC 2822 3.6.4, id-right = dot-atom-text / no-fold-literal / obs-id-right
Also, Rspamd has a spam filtering field 'MID_RHS_NOT_FQDN' which defaults to a 1.0 score.

This commit suggests an FQDN in the docker-compose file, which is guaranteed to meet the requirement.
---
 docker-compose.yml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/docker-compose.yml b/docker-compose.yml
index 23c3ee86..e15ea101 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -43,6 +43,7 @@ services:
   app:
     <<: *app-defaults
     container_name: listmonk_app
+    hostname: listmonk.example.com # Recommend using FQDN for hostname
     depends_on:
       - db
     volumes: