In-Reply-To and References headers created when event.category is not 'created' but unuseful

[Jun Omae]

When requesting password reset on ​th:AccountManagerPlugin, the following mail is generated like the following. EmailDistributor in Trac core generates In-Reply-To and References headers. The behavior makes sense for Trac resources (wiki, ticket, …) but not for other resources.

Return-Path: <jun66j5@example.com>
X-Original-To: jun66j5+1.6-sqlite@gmail.com
Delivered-To: jun66j5+1.6-sqlite@gmail.com
Received: from [127.0.0.1] (unknown [192.168.11.122])
        by godai.qova.net (Postfix) with ESMTP id 2B789824167
        for <jun66j5+1.6-sqlite@gmail.com>; Wed, 29 Mar 2023 16:46:50 +0900 (JST)
Content-Type: multipart/related;
 boundary="===============0630719524542272252=="
MIME-Version: 1.0
X-Mailer: Trac 1.6, by Edgewall Software
X-Trac-Version: 1.6
X-Trac-Project: 1.6.x
X-URL:
X-Trac-Realm: account
Precedence: bulk
Auto-Submitted: auto-generated
Message-ID: <015.20130fa5edd54658452c919a7af84c9f@example.com>
In-Reply-To: <015.e8b23c6cb8da1c3e885c4e0b65faa7ab@example.com>
References: <015.e8b23c6cb8da1c3e885c4e0b65faa7ab@example.com>
Date: Wed, 29 Mar 2023 07:46:50 -0000
To: undisclosed-recipients: ;
From: "1.6.x" <jun66j5@example.com>
Reply-To: trac@localhost
Subject: [1.6.x] Account password reset: admin

--===============0630719524542272252==
MIME-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 7bit

Your Trac password has been reset.

Here is your account information:

Login URL: <http://192.168.11.122:3000/1.6-sqlite/login>
Username: admin
Password: VbVqjoAM

--
1.6.x <>
Trac 1.6.x

--===============0630719524542272252==--