Contrib.social

Some messages have two "Content-Type" headers

Open on Drupal.org →
Created on 24 November 2023, over 1 year ago
Updated 3 December 2023, over 1 year ago

Problem/Motivation

Some (single-part?) messages have an extra Content-Type header, which causes some spam filters to reject messages.

Example rejection message from a real spam filter:

<email-redacted@example.com>: host mx10.spamshield.eu[109.237.215.10] said: 550 Messages
    should have one or no Content-Type headers, not 2. (in reply to end of DATA
    command)

Steps to reproduce

  • set up a fresh Drupal 10.2 test site
  • composer require drupal/symfony_mailer_lite
  • enable Mail System and Drupal Symfony Mailer Lite
  • on /admin/config/system/mailsystem, set the default sender to Drupal Symfony Mailer Lite
  • on /admin/config/system/symfony-mailer-lite/transport, configure an appropriate transport for your test environment
  • log out, then go to /user/password and send yourself a password reset email
  • the resulting message has 2 Content-Type headers:
Received: from [127.0.0.1] (localhost [127.0.0.1])
        by d10-web (Mailpit) with SMTP
        for ; Fri, 24 Nov 2023 21:15:12 +0000 (UTC)
Subject: Replacement login information for admin at Drush Site-Install
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8; format=flowed; delsp=yes;
 charset=UTF-8; format=flowed; delsp=yes
X-Mailer: Drupal
Return-Path: <admin@example.com>
Sender: admin@example.com
Reply-to: admin@example.com
To: admin@example.com
From: Drush Site-Install 
Message-ID: <15d6e90e8e79feed0279f630658a9ace@example.com>
Date: Fri, 24 Nov 2023 21:15:12 +0000
Content-Type: text/plain; charset="text/plain"
Content-Transfer-Encoding: quoted-printable

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes

🐛 Bug report
Status

Fixed

Version

1.0

Component

Code

Created by

🇺🇸United States smokris Athens, Ohio, USA

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