Knowledgebase

HTML is typically stripped out of messages went through the mailing list by default to prevent spam and ensure compatibility with text-based email clients. However, if you want to allow HTML messages, you’ll need to adjust the content filtering settings.

Steps to Allow HTML Emails in Mailing Lists:

1. Log in to the Mailing List Interface

   • Access mailing list under "Email" -> "Mailing Lists", then "manage".

2. Navigate to Content Filtering Settings

   • Click on Privacy options → Sender filters.
   • Ensure that "Action to take for postings from non-members" is set appropriately (e.g., accept or hold).

3. Allow HTML Content

   • Go to Content filtering settings.
   • Find the option "Should Mailman filter the content of list traffic?" and set it to No if you want to allow all content types.
   • If you want filtering but wish to allow HTML, set this option to Yes, and then adjust the settings below.

4. Configure Allowed MIME Types

   • In the "Remove message attachments that don’t have a matching content type", ensure that text/html is included in the "pass_mime_types" list.
   • Example of allowed MIME types:
     bash

      

     multipart/mixed multipart/alternative text/plain text/html
   • This allows both plain text and HTML emails while filtering out unwanted attachments.

5. Adjust Scrubbing and Formatting Settings

   • Set "Should Mailman convert text/html parts to plain text?" to No if you want HTML to be preserved.
   • Adjust the "Collapse multipart/alternative to its first part content" setting as needed (setting it to No helps preserve HTML messages).

6. Save Changes

   • Scroll down and click Submit Your Changes.